Aquí mostramos todas las imágenes que se han archivado para la Flora Digital. Las fotografías están organizadas alfabeticamente por nombre científico. Para navegar a través de la galería simplemente haga "click" sobre el nombre de especie deseado. Utilice los vinculos para facilitar la navegación p. ej. haga click sobre la letra P para ir rápidamente a Pachira, en vez de bajar por toda la lista.
| 2086 Especies de La Flora de la Selva | |||||
| Especie | Autor | Testigo | Sinónimos & Historia Taxonómica | Origen | # de img |
| Abarema adenophora | (Ducke) Barneby & J.W. Grimes | Aguilar 8215, LSCR. | Sin. Pithecellobium adenophorum Ducke; Hist. Tax. Pithecellobium macradenium | Nativa | 24 |
| Abelmoschus moschatus | Medik. | M. Grayum 2752 | Exótica | 28 | |
| Abrodictyum rigidum | (Sw.) Ebihara & Dubuisson | Gomez 6742 (CR) | Sin. Trichomanes rigidum Sw. | Nativa | - |
| Abuta panamensis | (Standl.) Krukoff & Barneby | Hartshorn 1116 | Sin. Hyperbaena panamensis Standl. | Nativa | 6 |
| Acacia mangium | Willd. | J. González 8263, LSCR. | Exótica | 9 | |
| Acalypha apodanthes | Standl. & L. O. Williams | Hammel 8676, DUKE, LSCR, MO. | Nativa | 4 | |
| Acalypha arvensis | Poepp. | O. Vargas 742, LSCR. | Nativa | 8 | |
| Acalypha costaricensis | (Kuntze) Knobl. ex Pax & K. Hoffm. | Aguilar 7784, LSCR. | Nativa | 19 | |
| Acalypha diversifolia | Jacq. | Hammel 8316, DUKE, LSCR, MO. | Nativa | 6 | |
| Acalypha macrostachya | Jacq. | Aguilar 8445, LSCR. | Nativa | 41 | |
| Acalypha radinostachya | Donn. Sm. | Hammel 8414, DUKE, LSCR. | Nativa | 15 | |
| Acalypha villosa | Jacq. | M. Grayum 2635, DUKE, MO. | Nativa | 5 | |
| Acianthera aberrans | (Luer) Pupulin & Bogarin | J. González 11281 | Sin. Pleurothallis aberrans Luer | Nativa | 16 |
| Acianthera pantasmi | (Rchb. f.) Pridgeon & M.W. Chase | M. Grayum 3003 | Sin. Pleurothallis pantasmi Rchb. f. | Nativa | 19 |
| Acianthera verecunda | Schltr. | Folsom 9789 | Sin. Pleurothallis verecunda Schltr. | Nativa | 17 |
| Aciotis indecora | (Bonpl.) Triana | Hammel 8159 | Sin. Aciotis rostellata (Naudin) Triana | Nativa | 11 |
| Aciotis rubricaulis | (Mart. ex DC.) Triana | Aguilar 7748 | Sin. Aciotis alata (Beurl.) Almeda, Sin. Aciotis caulialata (Ruiz & Pav.) Triana, Sin. Aciotis levyana Cogn. | Nativa | 17 |
| Acmella radicans | (Jacq.) R. K. Jansen | Sollins 21, DUKE. | Nativa | 3 | |
| Acroceras zizanioides | (Kunth) Dandy | B.Hammel 9190 | Sin. Acroceras oryzoides (Sw.) Stapf | Nativa | 9 |
| Adelia triloba | (Müll. Arg.) Hemsl. | Aguilar 7846, LSCR. | Nativa | 49 | |
| Adelobotrys adscendens | (Sw.) Triana | Aguilar 8468 | Nativa | 40 | |
| Adelonema hammelii | (Croat & Grayum) S. Y. Wong & Croat | B. Hammel 11429 | Sin. Homalomena hammelii Croat & Grayum | Nativa | - |
| Adelonema wendlandii | (Schott) S. Y. Wong & Croat | O. Vargas 1760 | Sin. Homalomena wendlandii Schott | Nativa | 16 |
| Adiantum latifolium | Lam. | M. Grayum 1006, M. Jones 14 | Hist. Tax. A. terminatum, A. reptans | Nativa | 14 |
| Adiantum macrophyllum | Sw. | M. Grayum 2676 | Nativa | 7 | |
| Adiantum obliquum | Willd. | Hammel 10656 | Nativa | 4 | |
| Adiantum petiolatum | Desv. | M. Grayum 988 | Nativa | 16 | |
| Adiantum seemannii | Hook. | Hammel 10252 | Nativa | - | |
| Adiantum tetraphyllum | Humb. & Bonpl. ex Willd. | Hammel 10799 | Sin. Adiantum fructuosum Poepp. ex Spreng. | Nativa | 6 |
| Adiantum villosum | L. | T. McDowell 1042 | Nativa | - | |
| Adiantum wilsonii | Hook. | Hammel 10875 | Nativa | - | |
| Adiantum x variopinnatum | Jermy & T. G. Walker | R. Moran 6297 | Sin. A. latifolium × A. petiolatum | Nativa | - |
| Aechmea angustifolia | Poepp. & Endl. | Aguilar 7765 | Nativa | 30 | |
| Aechmea bracteata | (Sw.) Griseb. | P. Lesica 4147 (MO) | Nativa | - | |
| Aechmea magdalenae | (André) André ex Baker | O. Vargas 1543 | Nativa | 21 | |
| Aechmea mariae-reginae | H. Wendl. | Aguilar 7585 | Nativa | 16 | |
| Aechmea mexicana | Baker | B. Hammel 7799 | Nativa | 9 | |
| Aechmea nudicaulis | (L.) Griseb. | Aguilar 7705 | Nativa | 16 | |
| Aechmea pubescens | Baker | B. Hammel 8004 | Nativa | 13 | |
| Aegiphila cephalophora | Standl. | M. Grayum 1493, DUKE. | Nativa | - | |
| Aegiphila falcata | Donn. Sm. | Aguilar 7994, LSCR. | Sin. Aegiphila martinicensis Jacq. | Nativa | 40 |
| Aegiphila laevis | (Aubl.) J.F. Gmel. | Hartshorn 1405, DUKE, F, LSCR, MO. | Sin. Aegiphila elata Sw. | Nativa | 10 |
| Aegiphila mollis | Kunth | Opler 1611 (CR), F, MO. | Nativa | - | |
| Aegiphila panamensis | Moldenke | Damon Smith 223, F, MO. | Nativa | 3 | |
| Aegiphila quararibeana | Rueda | R. Rueda 1414, CR, F, INB, MO. EspecimenTipo, | Nativa | 10 | |
| Aeschynomene americana | L. | Hammel 8351, DUKE. | Nativa | 10 | |
| Aeschynomene scabra | G. Don | B. Hammel 12777, DUKE, MO. | Nativa | 7 | |
| Aeschynomene sensitiva | Sw. | R. Wilbur 70416, DUKE, MO. | Nativa | - | |
| Ageratum houstonianum | Mill. | B. Hammel 11886 | Nativa | 6 | |
| Albizia adinocephala | (Donn. Sm.) Britton & Rose ex Record | Hammel 12176, MO. | Nativa | 13 | |
| Alchornea costaricensis | Pax & K. Hoffm. | Aguilar 7578, LSCR. | Nativa | 14 | |
| Alchornea latifolia | Sw. | B. Hammel 11982, DUKE, MO. | Nativa | 7 | |
| Alchorneopsis floribunda | (Benth.) Müll. Arg. | Aguilar 7660, LSCR. | Nativa | 27 | |
| Alibertia atlantica | (Dwyer) Delprete & C.H. Perss. | O. Vargas 1359 | Sin. Borojoa panamensis Dwyer | Nativa | 9 |
| Alibertia patinoi | (Cuatrec.) Delprete & C.H. Perss. | O. Vargas 1671 | Sin. Borojoa patinoi Cuatrec. | Nativa de CR Plantada en LS | 31 |
| Allamanda cathartica | L. | J. González 8397, LSCR. | Exótica | 6 | |
| Allomarkgrafia plumeriiflora | Woodson | B. Hammel 13010, DUKE. | Nativa | 7 | |
| Allophylus psilospermus | Radlk. | O. Vargas 1558 | Nativa | 4 | |
| Alocasia cucullata | (Lour.) Schott | B. Hammel 12304 | Exótica | 9 | |
| Alocasia longiloba | Miq. | M. Grayum 9450 | Exótica | 2 | |
| Alocasia macrorrhizos | (L.) Schott | M. Grayum 10692 | Exótica | 4 | |
| Alocasia plumbea | Van Houtte | M. Grayum 1796 | Exótica | 20 | |
| Alpinia purpurata | (Vieill.) K. Schum. | J. González 7709 | Exótica | 8 | |
| Alpinia zerumbet | (Pers.) B.L. Burtt & R.M. Sm. | J. González 8260 | Exótica | 5 | |
| Alseis costaricensis | C. M. Taylor | R. Aguilar 8501 | Nativa | 21 | |
| Alsophila cuspidata | (Kunze) D. S. Conant | M. Grayum 2516 | Sin. Nephelea cuspidata (Kunze) R. M. Tryon | Nativa | 9 |
| Alsophila firma | (Baker) D. S. Conant | M. Grayum 3071 | Sin. Nephelea mexicana (Schltdl. & Cham.) R. M. Tryon | Nativa | 28 |
| Alternanthera bettzickiana | (Regel) G. Nicholson | J. González & M. Grayum 9061, LSCR. | Exótica | 6 | |
| Alternanthera costaricensis | Kuntze | Hammel 9730, DUKE, LSCR. | Nativa | 4 | |
| Alternanthera laguroides | (Standl.) Standl. | B. Hammel 11858, DUKE. | Nativa | - | |
| Alternanthera sessilis | (L.) R. Br. | Hammel 8324, DUKE, LSCR. | Nativa | - | |
| Alternanthera tenella | Colla | O. Vargas 1385, LSCR. | Hist. Tax. Alternanthera ficoidea | Nativa | 8 |
| Amaranthus spinosus | L. | Hammel 8390, DUKE. | Nativa | 4 | |
| Ampelocera macrocarpa | Forero & A. H. Gentry | G. Hartshorn 1495 | Hist. Tax. Ampelocera hottlei | Nativa | 29 |
| Amphidasya longicalycina | (Dwyer) C.M. Taylor | Hammel 10843 | Sin. Amphidasya costaricensis C.M. Taylor, Hist. Tax. Amphidasya ambigua | Nativa | - |
| Amphilophium crucigerum | (L.) L.G. Lohmann | A. Chacon 695, MO. | Sin. Pithecoctenium echinatum (Jacq.) Baill., Sin. Pithecoctenium crucigerum (L.) A.H. Gentry | Nativa | - |
| Amphilophium paniculatum | (L.) Kunth | Hammel 8861, DUKE, MO. | Nativa | 14 | |
| Amphitecna kennedyae | (A. H. Gentry) A. H. Gentry | Hammel 11043, DUKE, MO. | Sin. Dendrosicus kennedyae A. H. Gentry | Nativa | 11 |
| Anacardium occidentale | L. | McDowell 799, DUKE, MO. | Exótica | 12 | |
| Ananas comosus | (L.) Merr. | O. Vargas 1666 | Nativa | 7 | |
| Ananthacorus angustifolius | (Sw.)Underw. & Maxon | M. Grayum 1058 | Sin. Vittaria costata Kunze | Nativa | 4 |
| Anathallis lewisiae | (Ames) R. Solano & Soto Arenas | M. A. Blanco 1590 | Sin. Pleurothallis lewisiae Ames, Specklinia lewisiae (Ames) Luer | Nativa | 5 |
| Anaxagorea crassipetala | Hemsl. | Hammel 11595, DUKE. | Nativa | 7 | |
| Anaxagorea phaeocarpa | Mart. | Aguilar 8291, LSCR. | Sin. Anaxagorea costaricensis R. E. Fr. | Nativa | 6 |
| Ancistrotropis peduncularis | (Kunth) A. Delgado | Aguilar 7623, LSCR. | Sin. Phaseolus peduncularis Kunth, Sin. Vigna peduncularis (Kunth) Fawc. & Rendle | Nativa | 10 |
| Andinocleome pilosa | (Benth.) Iltis & Cochrane | M. Grayum 8973 | Sin. Cleome pilosa Benth. | Nativa | - |
| Andira inermis | (Wright) Kunth | Aguilar 7926, LSCR. | Nativa | 25 | |
| Androlepis skinneri | Brongn. ex Houllet | B. Hammel 10750 | Sin. Androlepis donnell-smithii (Baker) Mez | Nativa | 22 |
| Andropogon bicornis | L. | M. Grayum 1473 | Nativa | 7 | |
| Anemopaegma chrysoleucum | (Kunth) Sandw. | Solano 1148, LSCR. | Nativa | 26 | |
| Anemopaegma orbiculatum | (Jacq.) DC. | Hammel 13208, DUKE, LSCR. | Nativa | 15 | |
| Anetium citrifolium | (L.) Splitg. | M. Grayum 1923 | Nativa | 11 | |
| Annona amazonica | R. E. Fr. | Aguilar 8202, LSCR. | Nativa | 18 | |
| Annona mucosa | Jacq. | D. Solano 1252, LSCR. | Sin. Rollinia mucosa Baill. | Nativa de CR Plantada en LS | 12 |
| Annona muricata | L. | J. González 8275, LSCR. | Exótica | 3 | |
| Annona papilionella | (Diels) H. Rainer | Aguilar 7637, LSCR. | Sin. Rollinia microsepala Standl., Sin. Rollinia pittieri Saff. | Nativa | 26 |
| Annona subnubila | H. Rainer, ined. | Aguilar 8346, LSCR. | Hist. Tax. Annona montana | Nativa | 7 |
| Anomospermum reticulatum | (Mart.) Eichler | B.Hammel 8703 | Nativa | 16 | |
| Anthephora hermaphrodita | (L.) Kuntze | R. Wilbur 37934 | Nativa | - | |
| Anthurium acutangulum | Engl. | O. Vargas 1529 | Nativa | 9 | |
| Anthurium austin-smithii | Croat & R. A. Baker | Hammel 10980 | Nativa | 5 | |
| Anthurium bakeri | Hook. f. | Aguilar 7870 | Nativa | 14 | |
| Anthurium bradeanum | Croat & Grayum | O. Vargas 1531 | Nativa | 7 | |
| Anthurium clavigerum | Poepp. | Aguilar 7815 | Nativa | 13 | |
| Anthurium clidemioides | Standl. | G. Hartshorn 939 | Nativa | 18 | |
| Anthurium consobrinum | Schott | Hammel 11627 | Sin. Anthurium cuneatissimum (Engl.) Croat | Nativa | 4 |
| Anthurium cuspidatum | Mast. | Hammel 8265 | Nativa | 14 | |
| Anthurium flexile | Schott | Aguilar 7960 | Nativa | 23 | |
| Anthurium formosum | Schott | O. Vargas 1562 | Nativa | 10 | |
| Anthurium friedrichsthalii | Schott | M. Grayum 2634 | Nativa | 8 | |
| Anthurium gracile | (Rudge) Schott | M. Grayum 2142 | Nativa | 3 | |
| Anthurium interruptum | Sodiro | D. Solano 1160 | Nativa | 16 | |
| Anthurium lancifolium | Schott | Hammel 11631 | Nativa | 10 | |
| Anthurium llanense | Croat | O. Vargas 621 | Nativa | 10 | |
| Anthurium obtusum | (Engl.) Grayum | Aguilar 7790 | Hist. Tax. Anthurium trinerve Miq. | Nativa | 19 |
| Anthurium ochranthum | K. Koch | O. Vargas 1535 | Nativa | 6 | |
| Anthurium pentaphyllum | (Aubl.) G. Don | Aguilar 8180 | Nativa | 14 | |
| Anthurium ramonense | Engl. ex K. Krause | Hammel 8207 | Nativa | 8 | |
| Anthurium ravenii | Croat & R. A. Baker | Hammel 8422 | Nativa | - | |
| Anthurium scandens | (Aubl.) Engl. | Aguilar 7932 | Nativa | 14 | |
| Anthurium spathiphyllum | N. E. Br. | Hammel 11132 | Nativa | 7 | |
| Anthurium subsignatum | Schott | Aguilar 7792 | Nativa | 23 | |
| Anthurium trisectum | Sodiro | Hammel 10457 | Nativa | 11 | |
| Anthurium upalaense | Croat & R. A. Baker | Aguilar 7864 | Nativa | 36 | |
| Apeiba membranacea | Spruce ex Benth. | Hammel & Trainer 10868 | Nativa | 31 | |
| Aphelandra aurantiaca | (Scheidw.) Lindl. | G. Frankie 1A, MO | Nativa | 3 | |
| Aphelandra dolichantha | Donn. Sm. | Aguilar 7783, LSCR. | Nativa | 6 | |
| Aphelandra golfodulcensis X sinclairiana | McDade & Nees | Hammel 8478, DUKE. | Nativa | 11 | |
| Aphelandra storkii | Leonard | Grayum 3029, DUKE, MO. | Nativa | 15 | |
| Arachis pintoi | Krapov. & W. C. Gregory | J. González 7652, LSCR. | Exótica | 4 | |
| Ardisia auriculata | Donn. Sm | Aguilar 8178 | Sin. Auriculardisia auriculata (Donn. Sm.) Lundell | Nativa | 16 |
| Ardisia compressa | Kunth | B. Hammel 11616 | Sin. Ardisia alstonii Lundell, Sin. Ardisia deminuta Lundell, Sin. Ardisia subsessilifolia Lundell, Hist. Tax. Ardisia guianensis | Nativa | 6 |
| Ardisia fimbrillifera | Lundell | Hammel 10950 | Sin. Auriculardisia fimbrillifera (Lundell) Lundell | Nativa | 21 |
| Ardisia nigropunctata | Oerst. | Aguilar 7645 | Sin. Auriculardisia nigropunctata (Oerst.) Lundell | Nativa | 20 |
| Ardisia opegrapha | Oerst. | Hammel 8769 | Sin. Graphardisia opegrapha (Oerst.) Lundell | Nativa | 6 |
| Ardisia pellucida | Oerst. | Hammel 10958 | Sin. Ardisia myriodonta Standl., Sin. Amatlania pellucida (Oerst.) Lundell | Nativa | 21 |
| Ardisia standleyana | P. H. Allen | Aguilar 7740 | Sin. Ardisia proctori Lundell, Sin. Icacorea standleyana (P.H. Allen) Lundell | Nativa | 5 |
| Ardisia wedelii | Lundell | B. Hammel 10959 | Sin. Auriculardisia wedelii (Lundell) Lundell | Nativa | 6 |
| Aristolochia cruenta | Barringer | B. Hammel 10242, DUKE. | Nativa | - | |
| Aristolochia gorgona | M. A. Blanco | O. Vargas 711, LSCR. | Hist. Tax. Aristolochia grandiflora | Nativa | 44 |
| Aristolochia pilosa | Kunth | J. MacDougal 994, DUKE. | Nativa | 1 | |
| Aristolochia sprucei | Mast. | Solano 1172, LSCR. | Sin. Aristolochia constricta Griseb. | Nativa | 34 |
| Aristolochia translucida | Pfeifer | O. Vargas 1317, LSCR. | Nativa | 26 | |
| Arthrostemma ciliatum | Pav. ex D. Don | Hammel 11009 | Nativa | 7 | |
| Artocarpus altilis | (Parkinson) Fosberg | O. Vargas 1580 | Sin. Artocarpus communis J. R. Forst. & G. Forst., Sin. Artocarpus incisus (Thumb) L. f. | Exótica | 25 |
| Artocarpus heterophyllus | Lam. | J. González 7706 | Ex󴩣a | - | |
| Arundinella berteroniana | (Schult.) Hitchc. & Chase | M. Grayum 986 | Nativa | 4 | |
| Asclepias curassavica | L. | Hammel 11534, DUKE, LSCR. | Nativa | 15 | |
| Aspidogyne tuerckheimii | (Schltr.) Garay | M. Grayum 2412 | Sin. Physurus tuerckheimii Schltr., Sin. Erythrodes tuerckheimii (Schltr.) Ames | Nativa | - |
| Aspidosperma desmanthum | Benth. ex Müll. Arg. | Aguilar 7726, LSCR. | Sin. Aspidosperma cruentum Woodson, Hist. Tax. A. megalocarpon, A. spruceanum | Nativa | 12 |
| Asplenium abscissum | Willd. | M. Grayum 2540 | Nativa | - | |
| Asplenium auritum | Sw. | Hammel 10638, M. Jones 28, 253 | Hist. Tax. Asplenium cuspidatum | Nativa | 7 |
| Asplenium cirrhatum | Rich. ex Willd. | M. Grayum 984 | Nativa | 10 | |
| Asplenium formosum | Willd. | Hammel 10658 | Nativa | 10 | |
| Asplenium holophlebium | Baker | M. Grayum 1252 | Nativa | 5 | |
| Asplenium hostmannii | Hieron. | M. Grayum 2105 | Hist. Tax. Asplenium otites, Asplenium sp A. | Nativa | 5 |
| Asplenium juglandifolium | Lam. | M. Grayum 1296 | Sin. Asplenium falcinellum Maxon | Nativa | 15 |
| Asplenium pteropus | Kaulf. | M. Grayum 1970 | Hist. Tax. Asplenium pseuderectum | Nativa | 4 |
| Asplenium riparium | Liebm. | M. Grayum 1348 | Sin. Asplenium obtusifolium L., Hist. Tax. Asplenium repandulum | Nativa | 6 |
| Asplenium serra | Langsd. & Fisch. | Hammel 11091 | Nativa | 10 | |
| Asplenium serratum | L. | Aguilar 7816 | Nativa | 22 | |
| Asplundia euryspatha | Harling | B. Hammel 11579, DUKE. | Nativa | 4 | |
| Asplundia ferruginea | Grayum & Hammel | B. Hammel 10759, DUKE, MO. | Nativa | 13 | |
| Asplundia longitepala | Harling | B. Hammel 11025, DUKE. | Hist. Tax. Asplundia antioquiae | Nativa | 7 |
| Asplundia multistaminata | Harling | Aguilar 7672, LSCR. | Nativa | 23 | |
| Asplundia sleeperae | Grayum & Hammel | M. Grayum 2791, DUKE. | Nativa | 14 | |
| Asplundia uncinata | Harling | M. Grayum 1312, DUKE. | Nativa | 16 | |
| Asplundia utilis | (Oerst.) Harling | Hammel 11569, DUKE, LSCR. | Sin. Asplundia costaricensis Harling | Nativa | 10 |
| Asplundia vagans | Harling | Hammel 8630, DUKE, LSCR. | Nativa | 6 | |
| Asterogyne martiana | (H. Wendl.) H. Wendl. ex Hemsl. | O. Vargas 723, LSCR. | Nativa | 35 | |
| Astrocaryum alatum | H. F. Loomis | Folsom 9400, DUKE, MO. | Sin. Hexopetion alatum (H. F. Loomis) F. Kahn & Pintaud | Nativa | 23 |
| Astrocaryum confertum | H. Wendl. ex Burret | M. Grayum 8970 | Nativa | 9 | |
| Averrhoa bilimbi | L. | Hammel 8062 | Exótica | 12 | |
| Averrhoa carambola | L. | J. González 7644 | Exótica | 11 | |
| Axonopus compressus | (Sw.) P. Beauv. | Hammel 8332 | Nativa | 13 | |
| Bacopa salzmannii | (Benth.) Wettst. ex Edwall | B. Hammel 12617 | Nativa | 8 | |
| Bactris caudata | H. Wendl. ex Burret | Aguilar 7752, LSCR. | Nativa | 19 | |
| Bactris coloradonis | L. H. Bailey | Hammel 8345, DUKE, LSCR, MO. | Sin. Bactris porschiana Burret | Nativa | 18 |
| Bactris gasipaes | Kunth | J. Mowbray 1524, DUKE. | Exótica | 8 | |
| Bactris gracilior | Burret | Aguilar 7664, LSCR. | Nativa | 21 | |
| Bactris hondurensis | Standl | Aguilar 7629, LSCR. | Sin. Bactris wendlandiana Burret | Nativa | 22 |
| Bactris longiseta | H. Wendl. ex Burret | Sears 145, DUKE. | Nativa | 10 | |
| Balizia elegans | (Ducke) Barneby & J. W. Grimes | Hammel 12412, DUKE. | Sin. Pithecellobium elegans Ducke; Albizia duckeana L. Rico; Hist. Tax. P. pedicellare | Nativa | 57 |
| Bambusa arundinacea | (Retz.) Willd. | O. Vargas 1279 | Exótica | 7 | |
| Bambusa vulgaris | Schrad. ex J. C. Wendl. | O. Vargas 1302 | Exótica | 7 | |
| Banisteriopsis caapi | (Spruce ex Griseb.) C.V. Morton | W. Anderson 13791, DUKE. | Hist. Tax. B. muricata | Exótica | 18 |
| Banisteriopsis elegans | (Triana & Planch.) Sandwith | O. Vargas 1881, LSCR. | Nativa | 6 | |
| Barleria oenotheroides | Dum. Cours. | Aguilar 8489, LSCR. | Sin. Barliera micans Nees | Nativa | 20 |
| Begonia fischeri | Schrank | B. Hammel 8377, DUKE, MO. | Nativa | - | |
| Begonia glabra | Aubl. | O. Vargas 1551, LSCR. | Nativa | 11 | |
| Begonia multinervia | Liebm. | Aguilar 7576, LSCR. | Nativa | 6 | |
| Begonia semiovata | Liebm. | Aguilar 8063, LSCR. | Nativa | 7 | |
| Begonia sericoneura | Liebm. | Aguilar 7631, LSCR. | Nativa | 7 | |
| Beilschmiedia alloiophylla | (Rusby) Kosterm. | Hammel 10551, DUKE, LSCR. | Hist. Tax. Beilschmiedia anay, Beilschmiedia sp A. | Nativa | - |
| Beilschmiedia costaricensis | (Mez & Pittier) C. K. Allen | Hammel 11766, DUKE, LSCR, MO. | Hist. Tax. Beilschmiedia mexicana, Beilschmiedia pendula | Nativa | - |
| Bellucia grossularioides | (L.) Triana | Aguilar 8278 | Hist. Tax. Bellucia pentamera | Nativa | 28 |
| Beloglottis subpandurata | (Ames & C. Schweinf.) Garay | O. Vargas 1197 | Nativa | 13 | |
| Bertiera bracteosa | (Donn. Sm.) B. Stähl & L. Andersson | Hammel 9672 | Sin. Gonzalagunia bracteosa (Donn. Sm.) B. L. Rob. | Nativa | 24 |
| Bertiera guianensis | Aubl. | Hammel 8190 | Nativa | 19 | |
| Besleria columneoides | Hanst. | Aguilar 7718, LSCR. | Nativa | 15 | |
| Besleria flavovirens | Nees & Mart. | Hammel 9679, DUKE, LSCR, MO. | Nativa | 7 | |
| Besleria macropoda | Donn. Sm. | M. Grayum 2953, DUKE, MO. | Nativa | - | |
| Besleria pauciflora | Rusby | Jacobs 2661, DUKE, MO. | Nativa | 3 | |
| Besleria robusta | Donn. Sm. | B.Hammel 8277, DUKE, LSCR. | Nativa | 7 | |
| Bidens pilosa | L. | M. Grayum 2720, DUKE, MO. | Nativa | 8 | |
| Bignonia hyacinthina | (Standl.) L.G. Lohmann | B.Hammel 8208, DUKE. | Sin. Mussatia hyacinthina (Standl.) Sandw. | Nativa | 11 |
| Bignonia noterophila | Mart. ex DC. | O. Vargas 1243, LSCR. | Hist. Tax. Bignonia binata, Clytostoma binatum | Nativa | 30 |
| Billia rosea | (Planch. & Linden) C. Ulloa & P. Jørg. | O. Vargas 1553 | Sin. B. columbiana Planch. & Linden; B. hippocastanum Peyr. | Nativa de CR Plantada en LS | 5 |
| Blakea dimorphophylla | (Almeda) Penneys & Almeda | B.Hammel 13241 | Sin. Topobea dimorphophylla Almeda, Hist. Tax. Blakea dimorphophylla | Nativa | 3 |
| Blakea maurofernandeziana | (Cogn.) Penneys & Almeda | B.Hammel 8485 | Sin. Topobea maurofernandeziana Cogn. | Nativa | 17 |
| Blakea scarlatina | Almeda | Hammel 9297 | Nativa | 8 | |
| Blechnum gracile | Kaulf. | B. Hammel 17433 | Sin. Blechnum fraxineum Willd. | Nativa | 5 |
| Blechnum occidentale | L. | Hammel 10169 | Nativa | 6 | |
| Blechnum polypodioides | Raddi | Barcock A72 | Nativa | 4 | |
| Blighia sapida | K. D. Konig | O. Vargas 1554 | Exótica | 4 | |
| Bocconia frutescens | L. | B. Hammel 17434 | Nativa | 11 | |
| Boehmeria aspera | Wedd. | Grayum 2717 | Nativa | 4 | |
| Boehmeria cylindrica | (L.) Sw. | Hammel & Trainer 10812 | Nativa | 10 | |
| Bolbitis aliena | (Sw.) Alston | M. Grayum 2499 | Nativa | - | |
| Bolbitis portoricensis | (Spreng.) Hennipman | Hammel 10645 | Nativa | 17 | |
| Bomarea obovata | Herb. | Aguilar 7638, LSCR. | Sin. Bomarea chontalensis Seem. | Nativa | 19 |
| Bougainvillea glabra | Choisy | J. González 8398 | Exótica | 11 | |
| Brassia caudata | (L.) Lindl. | Folsom 9545 | Nativa | 21 | |
| Bravaisia integerrima | (Spreng.) Standl. | B.Hammel 8455, DUKE. | Nativa | 28 | |
| Brenesia uncinata | (Fawc.) Luer | D. Smith 462 | Sin. Pleurothallis uncinata Fawc., Sin. Echinosepala uncinata (Faw.) Pridgeon & M. W. Chase, Sin. Myoxanthus uncinatus (Faw.) Luer, Sin. Echinella uncinata (Fawc.) Pridgeon & M.W. Chase | Nativa | 14 |
| Brosimum alicastrum | Sw. | Aguilar 7678 | Nativa | 2 | |
| Brosimum guianense | (Aubl.) Huber | Hammel 13071 | Nativa | 10 | |
| Brosimum lactescens | (S. Moore) C. C. Berg | B.Hammel & J.Trainer 13256 | Nativa | 27 | |
| Brosimum utile | (Kunth) Oken ex J. Presl | J. González 11241 | Nativa de CR Plantada en LS | - | |
| Browallia americana | L. | Hammel 11648 | Nativa | 10 | |
| Brownea rosa-de-monte | P.J. Bergius | O. Vargas 1177, LSCR. | Exótica | 18 | |
| Brunfelsia pauciflora | (Cham. & Schltdl.) Benth. | J.Gonzalez 7835 | Exótica | 6 | |
| Bulbophyllum pachyrachis | Griseb. | O. Vargas 1401 | Hist. Tax. Bulbophyllum aristatum, Bulbophyllum sp A. | Nativa | 11 |
| Bunchosia macrophylla | Rose ex Donn. Sm. | Aguilar 7594, LSCR. | Nativa | 15 | |
| Bunchosia polystachia | (Andrews( DC. | Solano 1253 | Sin. Bunchosia ocellata Lundell | Nativa | 21 |
| Bursera simaruba | (L.) Sarg. | B.Hammel 11098, DUKE. | Nativa | 14 | |
| Byrsonima arthropoda | A. Juss. | B. Hammel 12986 | Hist. Tax. Byrsonima crispa | Nativa | 4 |
| Byrsonima crassifolia | (L.) Kunth | R. Wilbur 34565 | Nativa de CR Plantada en LS | 14 | |
| Byttneria aculeata | (Jacq.) Jac. | Aguilar 7579 | Nativa | 21 | |
| Caesalpinia pulcherrima | (L.) Sw. | J. González 7617, LSCR. | Exótica | 2 | |
| Caladium bicolor | (Aiton) Vent. | M. Grayum 9449 | Nativa de CR Plantada en LS | 15 | |
| Caladium humboldtii | Schott | M. Grayum 9451 | Exótica | - | |
| Calathea crotalifera | S. Watson | J. González 7674 | Sin. Calathea insignis Petersen | Nativa | 6 |
| Calathea lasiostachya | (Kuntze) Borchs. & S. Suárez | O. Vargas 689 | Nativa | 16 | |
| Calathea lutea | (Aubl.) Schult. | O. Vargas 731 | Nativa | 29 | |
| Calathea similis | H. Kenn. | R. Wilbur 37398 | Nativa | 21 | |
| Calatola costaricensis | Standl. | B. Hammel 13258, DUKE. | Nativa | 12 | |
| Calea urticifolia | (Mill.) DC. | R. Wilbur 38232, DUKE. | Nativa | 2 | |
| Calliandra calothyrsus | Meisn. | J. González 8265, LSCR. | Exótica | 12 | |
| Callicarpa acuminata | Kunth | Aguilar 7854, LSCR. | Nativa | 24 | |
| Callichlamys latifolia | (Rich.) K. Schum. | Aguilar 7720, LSCR. | Nativa | 28 | |
| Calophyllum brasiliense | Cambess. | Aguilar 7942 | Sin. Calophyllum rekoi Standl. | Nativa | 30 |
| Calopogonium caeruleum | (Benth.) Sauvalle | M. Grayum 2672, DUKE. | Nativa | - | |
| Calopogonium mucunoides | Desv. | R. Wilbur 63305, DUKE. | Nativa | 3 | |
| Calyptrocarya glomerulata | (Brongn.) Urb. | Hammel 8151 | Nativa | 6 | |
| Calyptrocarya poeppigiana | Kunth | Hammel 8382 | Nativa | 4 | |
| Calyptrogyne ghiesbreghtiana | (Linden & H Wendl.) H. Wendl. | D. Solano 1271, LSCR. | Sin. Calyptrogyne sarapiquensis H. Wendl. ex Burret | Nativa | 33 |
| Camaridium neglectum | (Schltr.) M. A. Blanco | Aguilar 8401 | Sin. Maxillaria neglecta (Schltr.) L. O. Williams, Sin. Ornithidium neglectum Schltr. | Nativa | 11 |
| Campylocentrum fasciola | (Lindl.) Cogn. | Attwood 85-90 | Nativa | 5 | |
| Campylocentrum micranthum | (Lindl.) Maury | O. Vargas 1498 | Nativa | 24 | |
| Campyloneurum angustifolium | (Sw.) Fée | Hammel 10668 | Sin. Polypodium angustifolium Sw. | Nativa | - |
| Campyloneurum aphanophlebium | (Kunze) T. Moore | M. Grayum 1921 | Sin. Polypodium aphanophlebium Kuntze | Nativa | 4 |
| Campyloneurum brevifolium | (Lodd. ex Link) Link | B.Hammel 10628 | Sin. Campyloneurum latum T. Moore, Sin. Polypodium latum (T. Moore) T. Moore ex Sodiro, Sin. Campyloneurum phyllitidis (L.) C. Presl | Nativa | 5 |
| Campyloneurum sphenodes | (Kunze & Klotzsch) Fée. | M. Grayum 1359 | Sin. Polypodium sphenoides Kunze & Klotzsch | Nativa | 6 |
| Cananga odorata | (Lam.) Hook. f. & Thomson | Hammel 8348, DUKE. | Exótica | 4 | |
| Canavalia oxyphylla | Standl. & L. 0. Williams | M. Grayum 2625, DUKE, MO. | Nativa | 11 | |
| Canna tuerckheimii | Kraenzl. | B. Hammel 8309, DUKE, MO. | Nativa | 13 | |
| Caperonia palustris | (L.) A. St.-Hil. | R. Wilbur 38696, DUKE. | Nativa | 18 | |
| Capparidastrum discolor | (Donn. Sm.) Cornejo & Iltis | O. Vargas 1360, LSCR. | Sin. Capparis discolor Donn. Sm., Sin. Capparis uniflora Woodson | Nativa | 16 |
| Capparidastrum frondosum | (Jacq.) Cornejo & Iltis | Hammel 9503, DUKE. | Sin. Capparis frondosa Jacq. | Nativa | 2 |
| Capsicum annuum | L. | O. Vargas 1659 | Nativa | 13 | |
| Capsicum frutescens | L. | T. McDowell 796 | Nativa | 1 | |
| Carapa nicaraguensis | Audl. | Hartshorn 1274 | Hist. Tax. Carapa guianensis | Nativa | 12 |
| Carapichea ipecacuanha | (Brot.) Stokes | O. Vargas 1169 | Sin. Cephaelis ipecacuanha (Brot.) A. Rich., Sin. Psytrochia ipecacuanha (Brot.) L. Anderson | Nativa de CR Plantada en LS | 12 |
| Cardamine bonariensis | Pers. | Hammel 11902, DUKE. | Sin. Cardamine flaccida Cham. & Schltdl. | Nativa | 18 |
| Carica papaya | L. | B. Hammel 9968, DUKE. | Nativa | 17 | |
| Carludovica rotundifolia | H. Wendl. ex Hook. f. | I. Chacon 1279, MO. | Nativa | 7 | |
| Carludovica sulcata | Hammel | B. Hammel 13330, MO. | Nativa | 28 | |
| Carpotroche platyptera | Pittier | R. Aguilar 8422, LSCR. | Sin. Carpotroche crassiramea Pittier, Sin. Carpotroche glaucescens Pittier | Nativa | 21 |
| Caryodendron angustifolium | Standl. | Aguilar 8247, LSCR. | Nativa | 37 | |
| Casearia arborea | (Rich.) Urb. | Hammel 9315 | Nativa | 6 | |
| Casearia commersoniana | Cambess. | Hammel 8194 | Nativa | 9 | |
| Casearia coronata | Standl. & L. 0. Williams | G. Hartshorn 2250 | Nativa | 28 | |
| Casearia corymbosa | Kunth | Aguilar 8284 | Nativa | 33 | |
| Casearia sylvestris | Sw. | Aguilar 8487 | Nativa | 26 | |
| Casearia tacanensis | Lundell | Nativa | 8 | ||
| Cassia grandis | L. f. | B. Hammel 12637, DUKE. | Nativa de CR Plantada en LS | - | |
| Cassipourea elliptica | (Sw.) Poir. | Hammel 9094 | Nativa | 8 | |
| Castilla elastica | Sessé | Aguilar 7934 | Nativa | 54 | |
| Catasetum maculatum | Kunth | R. Aguilar 8188 (LSCR) | Nativa | 47 | |
| Catharanthus roseus | (L.) G. Don | J. González 7623, LSCR. | Exótica | 7 | |
| Catopsis juncifolia | Mez & Wercklé ex Mez | D. Smith 203 | Nativa | 3 | |
| Catopsis morreniana | Mez | J. Folson 8744 | Nativa | - | |
| Catopsis sessiliflora | (Ruiz & Pav.) Mez | Aguilar 8410 | Nativa | 23 | |
| Cayaponia cf. bidentata | (R.J. Hampshire) P. Duchen & S.S. Renner | D. Solano 1162, LSCR | Nativa | 4 | |
| Cayaponia glandulosa | (Poepp. & Endl.) Cogn. | Jacobs 2804, MO. | Nativa | - | |
| Cayaponia hammelii | Grayum -sp. nov. ined. | Hammel 9565, DUKE. | Nativa | - | |
| Cayaponia prunifera | (Poepp. & Endl.) Duchen & S. S. Renner | Hammel 8437, DUKE, LSCR. | Sin. Selysia prunifera (Poepp. & Endl.) Cogn. | Nativa | 5 |
| Cayaponia racemosa | (Mill.) Cogn. | Hammel 10956, DUKE. | Nativa | 19 | |
| Cayaponia sp. A | ? | Hammel 8340, DUKE, LSCR. | Hist. Tax. C. granatensis | Nativa | - |
| Cecropia insignis | Liebm. | B. Hammel 11129 | Nativa | 16 | |
| Cecropia obtusifolia | Bertol. | O. Vargas 752 | Nativa | 30 | |
| Cedrela odorata | L. | B.Hammel & J.Trainer 10818 | Sin. Cedrela mexicana Roem. | Nativa | 9 |
| Ceiba pentandra | (L.) Gaertn. | O. Vargas 557 | Nativa | 50 | |
| Celtis iguanaea | (Jacq.) Sarg. | J. González 7832, LSCR. | Nativa | 11 | |
| Celtis schippii | Trel. ex Standl. | Hammel 13018, LSCR, MO. | Sin. Sparrea schippii (Trel. ex Satndl.) Hunz. & Dottori | Nativa | 3 |
| Cenchrus purpureus | (Schumach.) Morrone | Hammel 8310 | Sin. Pennisetum purpureum Schumach. | Exótica | 7 |
| Centradenia inaequilateralis | (Schltdl. & Cham.) G. Don | Nativa | 2 | ||
| Centropogon coccineus | (Hook.) Regel ex B. D. Jacks. | R. Wilbur 37878, DUKE. | Nativa | - | |
| Ceratopteris thalictroides | Brongn. | O. Vargas 1731, M. A. Blanco 1579 (USJ) | Nativa | 3 | |
| Cespedesia spathulata | (Ruiz & Pav.) Planch. | Aguilar 8279 | Sin. Cespedesia macrophylla Seem. | Nativa | 36 |
| Cestrum microcalyx | Francey | Aguilar 7676 | Nativa | 22 | |
| Cestrum racemosum | Ruiz & Pav. | Hammel 8643 | Sin. Cestrum panamense Standl. | Nativa | 6 |
| Cestrum reflexum | Sendtn. | Jacobs 3014 (DUKE) | Nativa | - | |
| Cestrum schlechtendalii | G. Don | Aguilar 7923 | Hist. Tax. C. megalophyllum, Sin. Cestrum baenitzii Lingelsh. | Nativa | 6 |
| Chamaecrista nictitans | (L.) Moench | J. González 7765, LSCR. | Exótica | 9 | |
| Chamaedorea deckeriana | (Klotzsch) Hemsl. | Chazdon 26, DUKE. | Nativa | 7 | |
| Chamaedorea lucidifrons | L. H. Bailey | O. Vargas 739, LSCR. | Sin. Chamaedorea selvae Hodel | Nativa | 11 |
| Chamaedorea pinnatifrons | (Jacq.) Oerst. | B. Hammel 6449, DUKE. | Hist. Tax. Chamaedorea wascewiczii | Nativa | 12 |
| Chamaedorea tepejilote | Liebm. | D. Solano 1247, LSCR. | Sin. Chamaedorea exorrhiza H. Wendl. Ex Guillaumin | Nativa | 20 |
| Chamissoa altissima | (Jacq.) Kunth | Hammel 8144, DUKE, LSCR. | Nativa | 4 | |
| Chaptalia nutans | (L.) Pol. | Aguilar 7677, LSCR. | Nativa | 15 | |
| Cheiloclinium belizense | (Standl.) A. C. Sm. | Hammel 9277, MO. | Nativa | - | |
| Chimarrhis parviflora | Standl. | Hammel 9753 | Nativa | 16 | |
| Chione venosa | (Sw.) Urb. | Hammel 8027 | Sin. Chione costaricensis Standl., Sin. Chione sylvicola (Standl.) W. C. Burger | Nativa | 16 |
| Chloris radiata | (L.) Sw. | J. González 9028 | Nativa | 3 | |
| Chorigyne pendula | (Hammel) R. Erikss. | O. Vargas 1375, LSCR. | Sin. Sphaeradenia pendula Hammel | Nativa | 7 |
| Christensonella uncata | (Lindl.) Szlach., Mytnik, Górniak & Smiszek | O. Vargas 1275 | Sin. Maxillaria uncata Lindl. | Nativa | 18 |
| Chromolaena odorata | (L.) R. M. King & H. Rob. | R. Wilbur 38332, DUKE. | Sin. Eupatorium odoratum L. | Nativa | 9 |
| Chrysochlamys glauca | (Oerst., Planch. & Triana) Hemsl | Hammel 8771 | Sin. Tovomitopsis glauca Oerst. | Nativa | 10 |
| Chrysochlamys nicaraguensis | (Oerst., Planch. & Triana) Hemsl | Aguilar 8191 | Sin. Tovomitopsis nicaraguensis Oerst., Planch. & Triana | Nativa | 19 |
| Chrysochlamys silvicola | (Hammel) Hammel | Hammel 10965 | Sin. Tovomitopsis silvicola Hammel | Nativa | 18 |
| Chrysophyllum cainito | L. | Aguilar 8498 | Exótica | 16 | |
| Chrysophyllum colombianum | (Aubrév.) T. D. Penn. | G. Hartshorn 1023 | Nativa | 7 | |
| Chrysophyllum venezuelanense | (Pierre) T. D. Penn. | Aguilar 7666 | Sin. Pouteria lucentifolia (Standl.) Boehni | Nativa | 25 |
| Chrysothemis friedrichsthaliana | (Hanst.) H. E. Moore | O. Vargas 1526, LSCR. | Nativa | 9 | |
| Chrysothemis pulchella | (Donn) Decne. | O. Vargas 1524, LSCR. | Nativa de CR Plantada en LS ? | 7 | |
| Chusquea simpliciflora | Munro | Hammel 11078 | Nativa | - | |
| Cinnamomum chavarrianum | (Hammel) Kosterm. | Aguilar 7987, LSCR. | Sin. Phoebe chavarriana Hammel | Nativa | 20 |
| Cionosicys guabubu | Grayum & J. A. González -sp. nov. ined. | Hammel 8009, DUKE. | Nativa | - | |
| Cissampelos andromorpha | DC. | Hammel 8146 | Nativa | 4 | |
| Cissampelos grandifolia | Triana & Planch. | Hammel 8141 | Nativa | - | |
| Cissampelos pareira | L. | B. Hammel 12439 | Nativa | 3 | |
| Cissampelos tropaeolifolia | DC. | Aguilar 7985 | Nativa | 16 | |
| Cissus biformifolia | Standl. | Aguilar 7998 | Hist. Tax. C. fuliginea, Hist. Tax. C. gossypiifolia | Nativa | 23 |
| Cissus microcarpa | Vahl | Hammel 8413 | Nativa | - | |
| Cissus pseudofuliginea | Lombardi | McDowell 376 | Sin. Cissus anisophylla Lombardi, Hist. Tax. C. pseudosicyoides | Nativa | - |
| Cissus verticillata | (L.) Nicolson & C. E. Jarvis | Hammel 8458 | Sin. Cissus sicyoides L. | Nativa | 19 |
| Citrullus lanatus | (Thunb.) Matsum. & Nakai | J. González 9260, LSCR. | Exótica | 8 | |
| Citrus aurantifolia | (Christm.) Swingle | J. González 8277 | [limón] | Exótica | 4 |
| Citrus aurantium | L. | [naranja agria] | Exótica | - | |
| Citrus limon | (L.) Burm. f. | O. Vargas 1707 | [limón] | Exótica | 10 |
| Citrus maxima | (Burm. ex Rumph.) Merr. | O. Vargas 1738 | Sin. Citrus grandis (L.) Osbeck [shaddock, pomelo] | Exótica | 3 |
| Citrus reticulata | Blanco | J. González 9259 | [mandarina] | Exótica | 4 |
| Citrus sinensis | (L.) Osbeck | [naranja dulce] | Exótica | 7 | |
| Clarisia mexicana | (Liebm.) Lanj. | G. Hartshorn 1477 | Hist. Tax. Clarisia biflora | Nativa | 38 |
| Clavija costaricana | Pittier | Aguilar 8312 | Nativa | 50 | |
| Cleoserrata serrata | (Jacq.) Iltis | O. Vargas 1224 | Sin. Cleome serrata Jacq. | Nativa | 17 |
| Clerodendrum paniculatum | L. | G. Vargas 1269, LSCR. | Exótica | 10 | |
| Clethra costaricensis | Britton | Aguilar 8152, LSCR. | Hist. Tax. Clethra mexicana A. DC., Hist. Tax. Clethra lanata M. Martens & Galeotti | Nativa | 27 |
| Clethra hondurensis | Britton | O. Vargas 1248, LSCR. | Nativa | 11 | |
| Clibadium eggersii | Hieron. | Hammel 8135, DUKE, LSCR, MO. | Hist. Tax. Clibadium pittieri | Nativa | 3 |
| Clibadium grandifolium | S.F. Blake | Hammel 9240, DUKE, LSCR, MO. | Hist. Tax. Clibadium sylvestre | Nativa | - |
| Clibadium surinamense | L. | Hammel 8980, DUKE, LSCR. | Nativa | 17 | |
| Clidemia capitellata | (Bonpl.) D. Don | Hammel 12537 | Nativa | 10 | |
| Clidemia crenulata | Gleason | Aguilar 7582 | Nativa | 12 | |
| Clidemia dentata | Pav. ex D. Don | Aguilar 8266 | Nativa | 13 | |
| Clidemia discolor | (Triana) Cogn. | Hammel 8371 | Sin. Clidemia purpureoviolacea Cogn. | Nativa | 7 |
| Clidemia epiphytica | (Triana) Cogn. | Aguilar 8250 | Nativa | 25 | |
| Clidemia hammelii | Almeda | Hammel 9682 | Nativa | 14 | |
| Clidemia hirta | (L.) D. Don | B. Hammel 12536 | Nativa | 14 | |
| Clidemia japurensis | DC. | Aguilar 8277 | Nativa | 26 | |
| Clidemia ombrophila | Gleason | Hammel 9639 | Nativa | 16 | |
| Clidemia pubescens | Gleason | M. Grayum 2888 | Nativa | - | |
| Clidemia septuplinervia | Cogn. | Aguilar 7964 | Nativa | 17 | |
| Clidemia setosa | (Triana) Gleason | B.Hammel 10923 | Nativa | 9 | |
| Clusia amazonica | Planch. & Triana | B. Hammel 10153 | Sin. Clusia oedematopoidea Maguire | Nativa | - |
| Clusia cooperi | Standl. | Jacobs 2832 | Hist. Tax. C. quadrangula | Nativa | 3 |
| Clusia croatii | D’Arcy | Hartshorn 1847 | Hist. Tax. Clusia minor | Nativa | 23 |
| Clusia cylindrica | Hammel | Hammel 8635 | Nativa | 7 | |
| Clusia flava | Jacq. | Aguilar 7690 | Nativa | 17 | |
| Clusia gracilis | Standl. | Aguilar 8121 | Nativa | 28 | |
| Clusia penduliflora | Engl. | D. Smith 11 | Hist. Tax. Clusia amazonica | Nativa | - |
| Clusia stenophylla | Standl. | Hammel 8931 | Nativa | - | |
| Clusia uvitana | Pittier | Aguilar 8049 | Sin. Clusia erectistigma Maguire | Nativa | 19 |
| Clusia valerioi | Standl. | B. Hammel 8795 | Nativa | 6 | |
| Clusiella isthmensis | Hammel | Hammel 8252 | Hist. Tax. Clusia elegans aff. | Nativa | - |
| Coccocypselum hispidulum | (Standl.) Standl. | Hammel 11064 | HIst. Tax. Coccocypselum herbaceum | Nativa | 19 |
| Coccoloba parimensis | Benth. | Grayum & King 9337 | Hist. Tax. Coccoloba sp. B | Nativa | 5 |
| Coccoloba sp. A | ? | Hammel 8241 | Nativa | - | |
| Coccoloba tuerckheimii | Donn. Sm. | Hammel 11084 | Nativa | 27 | |
| Cochliasanthus caracalla | (L.) Trew | Aguilar 8243, LSCR. | Sin. Vigna caracalla (L.) Verdc. | Nativa | 45 |
| Cochlidium linearifolium | (Desv.) Maxon ex C. Chr. | M. Grayum 2461, O. Vargas 1283 | Sin. Grammitis linearifolia (Desv.) Steud. | Nativa | 4 |
| Cochlidium serrulatum | (Sw.) L. E. Bishop | M. Grayum 1068 | Sin. Grammitis serrulata (Sw.) Sw. | Nativa | 6 |
| Cochliostema odoratissimum | Lem. | Aguilar 7613, LSCR. | Nativa | 27 | |
| Cocos nucifera | L. | R. Wilbur 34302, DUKE. | Exótica | 5 | |
| Codiaeum variegatum | (L.) A. Juss. | J. González 9248, LSCR. | Exótica | 2 | |
| Codonanthopsis crassifolia | (H. Focke) Chautems & M. Perret | Solano 1132, LSCR. | Sin. Codonanthe crassifolia (H. Focke) C.V. Morton | Nativa | 14 |
| Codonanthopsis uleana | (Fritsch) Chautems & Perret, C. | B. Hammel 10424, DUKE. B. Hammel 9537. | Sin. Codonanthe uleana Fritsch, Hist. Tax. C macradenia | Nativa | 15 |
| Coffea canephora | Pierre ex. A. Frochner | O. Vargas 1280 | Hist. Tax. Coffea liberica Hiern | Exótica | 9 |
| Coix lacryma-jobi | L. | Hammel 8786 | Exótica | 19 | |
| Cojoba catenata | (Donn. Sm.) Britton & Rose | Aguilar 7668, LSCR. | Sin. Pithecellobium catenatum Donn. Sm. | Nativa | 16 |
| Cojoba sp. A | ? | Hammel 8672, DUKE, MO. | Hist. Tax. Cojoba valerioi | Nativa | 18 |
| Cola acuminata | (P. Beauv.) Schott & Endl. | J. González 7710 | Exótica | 8 | |
| Colocasia esculenta | (L.) Schott | M. Grayum 2555 | Exótica | 4 | |
| Colubrina spinosa | Donn. Sm. | B.Hammel 10622 | Nativa | 18 | |
| Columnea consanguinea | Hanst. | M. Grayum 2320, DUKE. | Sin. Dalbergeria consanguinea (Hanst.) Wiehler | Nativa | 7 |
| Columnea kalbreyeriana | Mast. | Hammel 8221, DUKE. | Sin. Dalbergaria kalbreyeriana (Mast.) Wiehler | Nativa | - |
| Columnea linearis | Oerst. | Hammel 8489, DUKE, LSCR. | Nativa | 35 | |
| Columnea maculata | C. V. Morton | B. Hammel 10847, DUKE, MO. | Nativa | 12 | |
| Columnea nicaraguensis | Oerst. | Aguilar 8217, LSCR. | Nativa | 13 | |
| Columnea purpurata | Hanst. | Aguilar 7630, LSCR. | Nativa | 7 | |
| Columnea sanguinolenta | (Klotzsch ex Oerst.) Hanst. | Hammel 12404, DUKE, LSCR, MO. | Sin. Trichantha sanguinolenta (Klotzsch ex Oerst.) Wiehler | Nativa | - |
| Combretum laxum | Jacq. | Aguilar 7997, LSCR. | Nativa | 10 | |
| Commelina diffusa | Burm. f. | Hammel 9356, DUKE, LSCR. | Nativa | 5 | |
| Compsoneura mexicana | (Hemsl.) Janovec | Aguilar 7650 | Hist. Tax. Compsoneura sprucei | Nativa | 31 |
| Conceveiba pleiostemona | Donn. Sm. | Aguilar 8211, LSCR. | Sin. Veconcibea pleiostemona (Donn. Sm.) Pax & K. Hoffm. | Nativa | 13 |
| Condea verticillata | (Jacq.) Harley & J.F.B. Pastore | Hammel 8641, DUKE, LSCR. | Sin. Hyptis verticillata Jacq. | Nativa de CR Plantada en LS | 6 |
| Connarus costaricensis | G. Schellenb. | O. Vargas 1131,LSCR. | Nativa | 14 | |
| Conostegia bracteata | Triana | Aguilar 7724 | Nativa | 9 | |
| Conostegia lasiopoda | Benth. | Hammel 9260 | Nativa | 10 | |
| Conostegia micrantha | Standl. | Hammel 8227 | Nativa | 6 | |
| Conostegia montana | (Sw.) D. Don | Aguilar 7575 | Nativa | 15 | |
| Conostegia rufescens | Naudin | Hammel 8852 | Sin. Conostegia formosa Macfad., Sin. Conostegia puberula Cogn., Hist. Tax. C. icosandra | Nativa | 14 |
| Conostegia setifera | Standl. | Folsom 9139 | Nativa | 11 | |
| Conostegia setosa | Triana | Aguilar 7722 | Nativa | 24 | |
| Conostegia subcrustulata | (Beurl.) Triana | Hammel 8900 | Nativa | 10 | |
| Conostegia xalapensis | (Bonpl.) D. Don ex DC. | O. Vargas 2087 (LSCR) | Nativa | 20 | |
| Conyza laevigata | (Rich) Pruski | B. Hammel 11872, DUKE. | Sin. Conyza apurensis Kunth | Nativa | - |
| Conyza sumatrensis | (Retz.) E. Walker | R. Wilbur 37876 | Sin. Erigeron bonariensis L., Conyza bonariensis (L.) Cronq. | Nativa | 4 |
| Cordia alliodora | (Ruiz & Pav.) Oken | Hartshorn 1343, DUKE, MO. | Nativa | 12 | |
| Cordia bicolor | A. DC. | G. Hartshorn 1482, DUKE, MO. | Nativa | 5 | |
| Cordia correae | J.S. Mill. | B. Hammel 8383, DUKE, MO. | Hist. Tax. C. protracta | Nativa | 3 |
| Cordia cymosa | (Donn. Sm.) Standl. | G. Hartshorn 896, MO. | Nativa | 2 | |
| Cordia dwyeri | Nowicke | Hammel 11094, DUKE, MO. | Nativa | 9 | |
| Cordia lucidula | I. M. Johnst. | Aguilar 7797, LSCR. | Nativa | 41 | |
| Cordia megalantha | S. F. Blake | K. Bawa 606, MO. | Nativa | 40 | |
| Cordia panamensis | L. Riley | Hartshorn 1579 (F) | Nativa de CR Plantada en LS | - | |
| Cordia porcata | Nowicke | Aguilar 7614, LSCR. Hammel 8289, | Hist. Tax. Cordia protracta | Nativa | 6 |
| Cordyline fruticosa | (L.) A. Chev. | J. González 8274, LSCR. | Exótica | 12 | |
| Cosmibuena macrocarpa | (Benth.) Klotzsch ex Walp. | B. Hammel 8620 | Nativa | 7 | |
| Costus barbatus | Suess. | B. E. Hammel 10823, DUKE. | Nativa | - | |
| Costus bracteatus | Rowlee | Hammel 11646, DUKE, MO. | Hist. Tax. Costus guanaiensis | Nativa | 18 |
| Costus laevis | Ruiz & Pav. | R. Wilbur 39695, DUKE. | Nativa | 17 | |
| Costus lima | L. | R. Wilbur 34701, DUKE. | Nativa | 7 | |
| Costus malortieanus | H. Wendl. | D. Solano 1415, LSCR. | Nativa | 28 | |
| Costus nitidus | Maas | B. Hammel 9655, DUKE. | Nativa | 13 | |
| Costus pulverulentus | Presl | B. Hammel 9161, DUKE. | Nativa | 7 | |
| Costus scaber | Ruiz & Pav. | Hammel 8708, DUKE. | Nativa | 9 | |
| Couepia janzenii | D. Santam. & Lagom. | G. Hartshorn 1287, DUKE. | Hist Tax. Couepia polyandra | Nativa | - |
| Coussapoa nymphaeifolia | Standl. | Hammel 11562 | Nativa | 10 | |
| Coussapoa villosa | Poepp. & Endl. | Aguilar 7675 | Sin. Coussapoa panamensis Pittier | Nativa | 10 |
| Coussarea impetiolaris | Donn. Sm. | G. Hartshorn 1637 | Nativa | 12 | |
| Coussarea talamancana | Standl. | G. Hartshorn 1499 | Nativa | 19 | |
| Coutarea hexandra | (Jacq.) K. Schum. | B. Hammel 11145 | Nativa | 9 | |
| Crassocephalum crepidioides | (Benth.) S. Moore | J. González 11577, LSCR. | Nativa | - | |
| Crateva tapia | L. | O. Vargas 1563, LSCR. | Nativa de CR Plantada en LS | 12 | |
| Crescentia cujete | L. | O. Vargas 1548, LSCR. | Nativa de CR Plantada en LS | 10 | |
| Crinum erubescens | Aiton | Aguilar 7809, LSCR. | Nativa | 16 | |
| Critonia morifolia | (Mill.) R. M. King & H. Rob. | Hammel 8140, DUKE, LSCR, MO. | Sin. Eupatorium morifolium Mill. | Nativa | 6 |
| Crossandra infundibuliformis | Nees | J. González 8269, LSCR. | Exótica | 3 | |
| Crossopetalum enervium | Hammel | E. Salicetti 255, LSCR. | Nativa | 15 | |
| Crotalaria micans | Link | I. Chacon 1289, DUKE, MO. | Nativa | - | |
| Crotalaria pallida | Aiton | Hammel 12175, DUKE, MO. | Sin. Crotalaria mucronata Desv. | Nativa | - |
| Crotalaria sagittalis | L. | B. Hammel 11007, DUKE. | Sin. Crotalaria rotundifolia J.F. Gmel. | Nativa | 6 |
| Croton billbergianus | Müll. Arg. | B. Hammel 11862, DUKE. | Nativa | 11 | |
| Croton brevipes | Pax | Hammel 12467, DUKE, LSCR, MO. | Nativa | 14 | |
| Croton draco | Schltdl. & Cham. | J. González 7760, LSCR. | Nativa | 7 | |
| Croton schiedeanus | Schltdl. | Hammel 8149, DUKE, LSCR. | Nativa | 4 | |
| Croton smithianus | Croizat | Hammel 11103, DUKE, LSCR. | Sin. Croton killipianus Croizat | Nativa | 5 |
| Croton trinitatis | Millsp. | Hammel 8902, DUKE, LSCR. | Nativa | 7 | |
| Cryosophila warscewiczii | (H. Wendl.) Bartlett | J. González 7735, LSCR. | Sin. Cryosophila albida Bartlett | Nativa | 18 |
| Cryptarrhena guatemalensis | Schltr. | O. Vargas 508 | Nativa | 8 | |
| Cryptochloa concinna | (Hook. f.) Swallen | Hammel 11042 | Nativa | 10 | |
| Ctenitis sloanei | (Poepp. ex Spreng.) C. V. Morton | Hammel 10609 | Nativa | - | |
| Cuatresia cuneata | (Standl.) Bohs | Hammel 8018 | Sin. Witheringia cuneata (Standl.) Hunz. | Nativa | 15 |
| Cuatresia exiguiflora | (D'Arcy) Hunz. | Hammel 8386 | Sin. Witheringia exiguiflora D'Arcy | Nativa | 7 |
| Cucumis melo | L. | B. Hammel 12705, DUKE. | Exótica | 3 | |
| Cucurbita pepo | L. | J. González 11036, LSCR. | Nativa de CR Plantada en LS | 10 | |
| Cupania cinerea | Poepp. | O. Vargas 1366 | Sin. Cupania costaricensis Radlk. | Nativa | 15 |
| Cupania dentata | DC. | B. Hammel 12890 | Hist. Tax. Cupania glabra | Nativa | - |
| Cupania pseudostipularis | T. D. Penn. ined. | Hammel 9696 | Hist. Tax. Cupania livida | Nativa | 16 |
| Cupania rufescens | Triana & Planch. | Hammel 8280 | Hist. Tax. Cupania hirsuta, Cupania guatemalensis | Nativa | 24 |
| Cuphea carthagenensis | (Jacq.) J.F. Macbr. | J. González 11013 LSCR | Nativa | 12 | |
| Cuphea elliptica | Koehne | R. Wilbur 66656, CR, DUKE. | Nativa | - | |
| Cuphea epilobiifolia | Koehne | Hammel 8373, DUKE, LSCR, MO. | Nativa | 14 | |
| Cuphea hyssopifolia | Kunth | Hammel 8375, DUKE, LSCR. | Nativa | 11 | |
| Cuphea utriculosa | Koehne | Hammel 8374, DUKE, LSCR. | Nativa | 12 | |
| Cyanthillium cinereum | (L.) H. Rob. | T. McDowell 344 | Sin. Vernonia cinerea (L.) Less. | Nativa | 13 |
| Cyathea bicrenata | Liebm. | M. Grayum 2517 | Sin. Trichipteris trichiata (Maxon) R. M. Tryon, Sin Cyathea trichiata (Maxon) Domin | Nativa | 29 |
| Cyathea delgadii | Sternb. | M. Jones 254, 536 (CR, LSCR) | Nativa | - | |
| Cyathea microdonta | (Desv.) Domin | Hammel 10696 | Sin. Trichipteris microdonta (Desv.) R. M. Tryon | Nativa | 10 |
| Cyathea multiflora | Sm. | Hammel 10722 | Nativa | 4 | |
| Cyathea schiedeana | (C. Presl) Domin | B. Hammel 10678 | Sin. Trichipteris schiedeana (C. Presl.) R. M. Tryon | Nativa | - |
| Cyathea ursina | (Maxon) Lellinger | Hammel 8710 | Sin. Trichipteris ursina (Maxon) R. M. Tryon | Nativa | 6 |
| Cyathula achyranthoides | (Kunth) Moq. | Hammel 8243, DUKE, LSCR. | Nativa | 5 | |
| Cyathula prostrata | (L.) Blume | Hammel 8369, DUKE, LSCR. | Nativa | 3 | |
| Cybianthus schlimii | (Hook. f.) G. Agostini | Aguilar 7742 | Sin. Correlliana spectabilis (Standl.) D'Arcy, Sin. Weigeltia spectabilis (Standl.) Lundell | Nativa | 26 |
| Cyclanthera multifoliola | Cogn. | Aguilar 8286, LSCR. | Nativa | 25 | |
| Cyclanthus bipartitus | Poit. | Smith 594, MO. | Nativa | 28 | |
| Cyclopeltis semicordata | (Sw.) J. Sm. | Hammel 8839 | Nativa | 10 | |
| Cyclopogon obliquus | (J.J. Sm.) Szlach | R. Wilbur 70180 | Sin. Pelexia obliqua (J.J. Sm.) Garay, Hist. Tax. Cyclopogon prasophyllum | Nativa | 21 |
| Cycnoches amparoanum | Schltr. | O. Vargas 560 | Hist. Tax. Cycnoches egertonianum | Nativa | 45 |
| Cymbopetalum costaricense | (Donn. Sm.) Saff. | D. Smith 209, DUKE. | Nativa | 19 | |
| Cymbopetalum torulosum | G. E. Schatz | Aguilar 7757, LSCR. | Nativa | 18 | |
| Cynodon nlemfuensis | Vanderyst | R. Wilbur 34024 | Hist. Tax. Cynodon dactylon | Exótica | - |
| Cyperus compressus | L. | B. Hammel 11864 | Nativa | - | |
| Cyperus costaricensis | Gómez-Laur | B. Hammel 10752 | Sin. Cyperus amplus G. C. Tucker | Nativa | 11 |
| Cyperus esculentus | L. | R. Wilbur 66667A | Nativa | - | |
| Cyperus flavescens | L. | R. Wilbur 37564 | Sin. Pycreus flavescens (L.) Rchb. | Nativa | - |
| Cyperus giganteus | Vahl | R. Wilbur 70415 | Nativa | 13 | |
| Cyperus iria | L. | J. González 9026, R. L. Wilbur 37119 | Nativa | 3 | |
| Cyperus laxus | Lam. | Hammel 8148 | Sin. Cyperus tolucensis Kunth | Nativa | 7 |
| Cyperus luzulae | (L.) Retz. | Opler 1856 | Nativa | 8 | |
| Cyperus miliifolius | Poepp. & Kunth ex Kunth | Hammel 8391 | Nativa | 8 | |
| Cyperus odoratus | L. | R. Wilbur 34554 | Sin. Torulinium odoratum (L.) S. S. Hooper | Nativa | 11 |
| Cyperus polystachyos | Rottb. | R. Wilbur 37065 | Sin. Pycreus polystachyos (Rottb.) P. Beauv. | Nativa | - |
| Cyperus simplex | Kunth | Hammel 10797 | Nativa | 4 | |
| Cyperus surinamensis | Rottb. | R. Wilbur 39371 | Nativa | - | |
| Cyperus tenuis | Sw. | Hammel 9245 | Nativa | 3 | |
| Cyperus thyrsiflorus | Jungh. | M. Grayum 2722 | Nativa | - | |
| Dactyloctenium aegyptium | (L.) Willd. | J. González 9035 | Exótica | 3 | |
| Dalbergia glomerata | Hemsl. | Hammel 12529, DUKE. | Sin. Dalbergia tucurensis Donn. Sm. | Nativa de CR Plantada en LS | 7 |
| Dalbergia melanocardium | Pittier | Hammel 11934, DUKE, MO. | Nativa | 9 | |
| Dalbergia monetaria | L. f. | O. Vargas 1238, LSCR. | Nativa | 5 | |
| Dalbergia retusa | Hemsl. | O. Vargas 1611, LSCR. | Nativa de CR Plantada en LS | 6 | |
| Dalechampia dioscoreifolia | Poepp. | B. Hammel 12360, DUKE, MO. | Nativa | 13 | |
| Dalechampia websteri | Armbr. | Armbruster 79-207, MO. | Nativa | 24 | |
| Danaea geniculata | Raddi | Hammel 10844 | Hist. Tax. Danaea sp. B, D. elliptica sensu Grayum & Churchill, 1989 | Nativa | - |
| Danaea leussinkiana | Christenh. | Hammel 11127 | Hist. Tax. Danaea sp. A, Hist. Tax. D. grandifolia sensu Grayum & Churchill, 1989 | Nativa | - |
| Danaea media | Liebm. | I. Chacón 1344 | Sin. Danaea grandifolia Underw., Hist Tax. D. nodosa | Nativa | 17 |
| Danaea moritziana | C. Presl | B. Hammel 11027 | Sin. Danaea cuspidata Liebm. | Nativa | 9 |
| Danaea wendlandii | Rchb. f. | Hammel 10650 | Nativa | 16 | |
| Davilla nitida | (Vahl) Kubitzki | B.Hammel 11570, LSCR, MO. | Sin. Davilla multiflora (DC.) A. St.-Hil. | Nativa | 19 |
| Dendropanax arboreus | (L.) Decne. & Planch. | Hammel 9102, DUKE, MO. | Nativa | 29 | |
| Dendropanax stenodontus | (Standl.) A. C. Sm. | Hammel 8471, DUKE, MO. | Nativa | 23 | |
| Dennstaedtia bipinnata | (Cav.) Maxon | Hammel 11120 | Nativa | - | |
| Dennstaedtia cicutaria | (Sw.) T. Moore | B. Hammel 13041 | Nativa | 17 | |
| Dennstaedtia cornuta | (Kaulf.) Mett. | Hammel 11079 | Hist. Tax. Dennstaedtia obtusifolia | Nativa | - |
| Desmodium adscendens | (Sw.) DC. | I. Chacón 980, DUKE, MO. | Nativa | - | |
| Desmodium axillare | (Sw.) DC. | J. González 7741, LSCR. | Nativa | 16 | |
| Desmodium barbatum | (L.) Benth. | J. González 11011, LSCR. | Nativa | 7 | |
| Desmodium heterocarpon | (L.) DC. | M. Grayum 9333, MO. | Exótica | 17 | |
| Desmodium incanum | (Sw.) DC. | R. Wilbur 37682, DUKE. | Nativa | - | |
| Desmodium purpusii | Brandegee | Hammel 11704, LSCR. | Sin. Desmodium macrodesmum (S. F. Blake) Standl. & Steyerm. | Nativa | 18 |
| Desmodium triflorum | (L.) DC. | R. Wilbur 63661, DUKE. | Nativa | 5 | |
| Desmoncus moorei | A.J. Hend. | T. Mowbray 1296, DUKE. | Hist. Tax. Desmoncus costaricensis, Desmoncus schippii | Nativa | 10 |
| Desmopsis microcarpa | R. E. Fr. | Aguilar 7577, LSCR. | Sin. Desmopsis glabrata Schery | Nativa | 20 |
| Desmopsis schippii | Standl. | B. Hammel 12389, DUKE | Sin. Desmopsis brevipes R. E. Fr. | Nativa | - |
| Diastema affine | Fritsch | M. Grayum 2744, DUKE. | Nativa | 7 | |
| Dichaea acroblephara | Schltr. | C. Todzia 617 | Sin. Dichaea standleyi Ames | Nativa | 10 |
| Dichaea panamensis | Lindl. | Aguilar 8447 | Nativa | 46 | |
| Dichaea sarapiquinsis | Folsom | M. Grayum 2153 | Nativa | 7 | |
| Dichaea squarrosa | Lindl. | C. Todzia 664 | Nativa | 3 | |
| Dichaea trulla | Rchb. f. | M. Grayum 1994 | Nativa | 13 | |
| Dichaea tuerckheimii | Schltr. | Folsom 9683 | Sin. Dichaea wercklei Schltr? | Nativa | 2 |
| Dichapetalum axillare | Woodson | Aguilar 7715, LSCR. | Nativa | 24 | |
| Dichapetalum grayumii | Prance | Aguilar 8122, LSCR. B, Hammel 18375 | Hist. Tax. Dichapetalum stipulatum, Dichapetalum nervatum | Nativa | 20 |
| Dichapetalum pedunculatum | (DC.) Baill. | Hammel 13080, DUKE. | Nativa | - | |
| Dichapetalum rugosum | (Vahl) Prance | Aguilar 8065, LSCR. | Nativa | 30 | |
| Dichorisandra amabilis | J. R. Grant | Hammel 11053, DUKE, LSCR. | Nativa | 17 | |
| Dichorisandra hexandra | (Aubl.) Standl.(bejuco) | Hammel 10883, DUKE, LSCR, MO. | Nativa | 5 | |
| Dicliptera podocephala | Donn. Sm. | M. Grayum 2750, DUKE. | Nativa | 1 | |
| Dicranoglossum panamense | (C. Chr.) L. D. Gómez | O. Vargas 1285 | Nativa | 7 | |
| Dicranopygium umbrophilum | Hammel | B.Hammel 8645, DUKE, LSCR. | Nativa | 11 | |
| Dicranopygium wedelii | Harling | Hammel 11453, LSCR. | Nativa | 2 | |
| Dicranostyles ampla | Ducke | Hammel 9280, DUKE, LSCR. | Nativa | 4 | |
| Didymochlaena truncatula | (Sw.) J. Sm. | Hammel 8770 | Nativa | 11 | |
| Didymoglossum angustifrons | Fée | O. Vargas 1284 | Sin. Trichomanes angustifrons (Fée) Wess. Boer | Nativa | 3 |
| Didymoglossum curtii | (Rosenst.) Pic. Serm. | M. Grayum 1925 | Sin. Trichomanes curtii Rosenst. | Nativa | 7 |
| Didymoglossum ekmanii | (Wess. Boer) Ebihara & Dubuisson | M. Grayum 1139 | Sin. Trichomanes ekmanii Wess. Boer | Nativa | 4 |
| Didymoglossum godmanii | (Hook.) Ebihara & Dubuisson | O. Vargas 1282 | Sin. Trichomanes godmanii Hook. | Nativa | 11 |
| Didymoglossum krausii | (Hook. & Grev.) C. Presl | Hammel 11097 | Sin. Trichomanes krausii Hook. & Grev. | Nativa | 8 |
| Didymoglossum membranaceum | (L.) Vareschi | M. Grayum 1140 | Sin. Trichomanes membranaceum L. | Nativa | 5 |
| Didymoglossum reptans | (Sw.) C. Presl | Wilbur 30165 | Sin. Trichomanes reptans Sw. | Nativa | - |
| Dieffenbachia beachiana | Croat & Grayum-ined. | Hammel 8122 | Nativa | 5 | |
| Dieffenbachia concinna | Croat & Grayum-ined. | B. Hammel 9772 | Nativa | 7 | |
| Dieffenbachia grayumiana | Croat | Hammel 8112 | Hist. Tax. Dieffenbachia seguine | Nativa | 4 |
| Dieffenbachia hammelii | Croat & Grayum | Hammel 8212 | Nativa | 1 | |
| Dieffenbachia nitidipetiolata | Croat & Grayum | Aguilar 7853 | Hist. Tax. Dieffenbachia logispatha | Nativa | 35 |
| Dieffenbachia oerstedii | Schott | Hammel 18606 | Nativa | 14 | |
| Dieffenbachia tonduzii | Croat & Grayum | Hammel 8613 | Hist. Tax. Dieffenbachia longivaginata | Nativa | 11 |
| Digitaria bicornis | (Lam.) Roem. & Schult. | J. González 9066 | Exótica | - | |
| Digitaria ciliaris | (Retz.) Koeler | Grayum 3939 | Sin. Digitaria adscendens (Kunth) Henrard | Nativa | - |
| Digitaria setigera | Roth ex Roem. & Schult. | R. Wilbur 63419 | Nativa | 12 | |
| Digitaria violascens | Link | Judziewicz 4326 | Exótica | 12 | |
| Dilodendron costaricense | (Radlk.) A. H. Gentry | J. González 11240 (LSCR) | Nativa de CR Plantada en LS | - | |
| Dimerandra emarginata | (G. Mey.) Hoehne | M Nunez KKK-296 | Nativa | 24 | |
| Dinizia excelsa | Ducke | O. Vargas 1394 | Exótica | 7 | |
| Dioclea malacocarpa | Ducke | J. Speery 708, DUKE. | Sin. Dioclea pulchra Moldenke | Nativa | 23 |
| Dioscorea alata | L. | McDowell 793, MO. | Nativa | - | |
| Dioscorea convolvulacea | Schltdl. & Cham. | B. Hammel 9715, DUKE. | Sin. Dioscorea joseensis R. Knuth | Nativa | - |
| Dioscorea cyanisticta | Donn Sm. | B. Hammel 10606, CR, DUKE, LSCR, MO. | Nativa | - | |
| Dioscorea hondurensis | R. Knuth | O. Vargas 1117, INB, LSCR. | Nativa | 16 | |
| Dioscorea pilosiuscula | Bertero ex Spreng. | J. González 11242, LSCR. | Nativa | 10 | |
| Dioscorea remota | C. V. Morton | B.Hammel 10186, DUKE, LSCR, MO. | Hist. Tax. Dioscorea bulbifera | Nativa | - |
| Dioscorea spiculiflora | Hemsl. | Hammel 10792, DUKE, LSCR. | Nativa | 8 | |
| Dioscorea trifida | L. | B. Hammel 12950, DUKE. | Nativa? | 9 | |
| Dioscorea urophylla | Hemsl. | M. Grayum 10009, DUKE, MO. | Nativa | 9 | |
| Diospyros blancoi | A. DC. | J. González 7708, LSCR. | Exótica | 6 | |
| Diplazium ceratolepis | (Christ) Christ | E. Scamman 7471 | Hist. Tax. Callipteris ceratolepis | Nativa | - |
| Diplazium cristatum | (Desr.) Alston | M. Grayum 3048 | Nativa | - | |
| Diplazium grandifolium | (Sw.) Sw. | M. Grayum 3044 | Nativa | - | |
| Diplazium ingens | H. Christ | B. Hammel 11990 | Nativa | - | |
| Diplazium lindbergii | (Mett.) Christ | M. Grayum 2542 | Nativa | 6 | |
| Diplazium macrophyllum | Desv. | M. Grayum 1264 | Nativa | 8 | |
| Diplazium pactile | Lellinger | Folsom 10155 | Sin. Callipteris pactilis (Lellinger) Pacheco & R. C. Moran, Hist. Tax. Diplazium macrodictyon | Nativa | 4 |
| Diplazium prominulum | Maxon | Hammel 10646 | Sin. Diplazium lonchophyllum sensu Grayum & Churchill, 1989, Hist. Tax. D. subsilvaticum | Nativa | 8 |
| Diplazium striatastrum | Lellinger | Hammel 10682 | Nativa | 17 | |
| Dipterocarpus hasseltii | Blume | O. Vargas 1392, LSCR. | Exótica | 6 | |
| Dipteryx panamensis | (Pittier) Record & Mell | Aguilar 7689, LSCR. | Sin. Coumarouna panamensis Pittier, Sin. Oleiocarpon panamense (Pittier) Dwyer | Nativa | 31 |
| Disciphania calocarpa | Standl. | Hammel 9182 | Nativa | 7 | |
| Disciphania ernstii | Eichler | O. Vargas 1221 | Hist. Tax. Disciphania sp. A | Nativa | 3 |
| Distictella magnoliifolia | (Kunth) Sandwith | O. Vargas 1295, Gentry 1116, 1127 | Hist. Tax. Indet. Sp., Distictella sp. A | Nativa | 26 |
| Doliocarpus multiflorus | Standl. | Hammel 8275, DUKE, LSCR, MO. | Hist. Tax. Doliocarpus dentatus | Nativa | 13 |
| Dorstenia choconiana | S. Watson | Aguilar 8314 | Nativa | 28 | |
| Dorstenia contrajerva | L. | B. Hammel 9465 | Nativa | 5 | |
| Dracaena fragrans | (L.) Ker Gawl. | J. González 8271 | Exótica | 8 | |
| Dracoglossum plantagineum | (Jacq.) Christenh. | M. Grayum 1485 | Sin. Tectaria plantaginea (Jacq.) Maxon | Nativa | - |
| Dracontium gigas | (Seem.) Engl. | J. Beach 1490 | Nativa | 16 | |
| Dryadella gnoma | (Luer) Luer | Atwood 85-22 (SEL) | Nativa | - | |
| Dryadella guatemalensis | (Schltr.) Luer | C. Todzia 1108 | Hist. Tax. Dryadella simula | Nativa | 6 |
| Dryadella odontostele | Luer | Richardson 288 | Hist. Tax. Dryadella pusiola | Nativa | 13 |
| Drymaria cordata | (L.) Willd. ex Roem. & Schult. | Hammel 8434, DUKE, MO. | Nativa | 1 | |
| Drymonia alloplectoides | Hanst. | Aguilar 7691, LSCR. | Nativa | 21 | |
| Drymonia coriacea | (Oerst. ex Hanst.) Wiehler | Aguilar 7822, LSCR. | Sin. Alloplectus coriaceus (Oerst. ex Hanst.) Hanst. | Nativa | 10 |
| Drymonia macrophylla | (Oerst.) H. E. Moore | Hammel 8198, DUKE, LSCR. | Nativa | 24 | |
| Drymonia multiflora | (Oerst. ex Hanst.) Wiehler | Grayum 8292, MO. | Nativa | - | |
| Drymonia pilifera | Wiehler | B.Hammel 9555, DUKE, LSCR. | Nativa | 13 | |
| Drymonia rubripilosa | Kriebel | R. Kriebel 3483, INBIO, 3994. | Nativa | 8 | |
| Drymonia serrulata | (Jacq.) Mart. | Aguilar 8260, LSCR. | Nativa | 31 | |
| Drymonia stenophylla | (Donn. Sm.) H. E. Moore | Aguilar 7735, LSCR. | Nativa | 11 | |
| Drymonia submarginalis | Gómez-Laur. & Chavarría | B.Hammel 10456, DUKE, LSCR. | Nativa | 16 | |
| Drymonia warszewicziana | Hanst. | B.Hammel 8673, DUKE, LSCR. | Nativa | 7 | |
| Drypetes standleyi | G. L. Webster | Hammel 9166 | Hist. Tax. Drypetes brownii | Nativa | 6 |
| Drypetes variabilis | Uittien | Hammel 12846; estéril | Nativa | 9 | |
| Durio zibethinus | Rumph. ex Murray | O. Vargas 1393 | Exótica | 6 | |
| Dussia macroprophyllata | (Donn. Sm.) Harms | Aguilar 7906, LSCR. | Hist. Tax. Dussia tessmannii | Nativa | 24 |
| Dussia sp. B | ? | N. Zamora 4001, LSCR. | Hist. Tax. D. cuscatlanica, D. atropurpurea , D. sp A | Nativa | 17 |
| Dystovomita paniculata | (Donn. Sm.) Hammel | Hammel 10966 | Sin. Dystovomita pittieri (Engl.) D'Arcy | Nativa | 22 |
| Echinochloa colona | (L.) Link | R. Wilbur 66351 | Exótica | 9 | |
| Echinochloa polystachya | (Kunth) Hitchc. | Hammel 9713 | Nativa | - | |
| Eclipta prostrata | (L.) L. | Hammel 8320, DUKE, LSCR. | Sin. Eclipta alba (L.) Hassk | Nativa | 3 |
| Eichhornia crassipes | (Mart.) Solms | R. L. Wilbur 63342 | Nativa | - | |
| Eichhornia diversifolia | (Vahl) Urb. | M. Grayum 8655 | Nativa | 4 | |
| Eirmocephala brachiata | (Benth. ex Oerst.) H. Rob. | Hammel 11540 | Sin. Vernonia brachiata Benth. ex Oerst. | Nativa | 15 |
| Elaeis guineensis | Jacq. | O. Vargas 1712, LSCR. | Exótica | 12 | |
| Elaphoglossum amygdalifolium | (Mett.) H. Christ | M. Grayum 1351 | Nativa | 8 | |
| Elaphoglossum correae | Mickel | Lloyd 4284 | Nativa | - | |
| Elaphoglossum grayumii | Mickel | M. Grayum 1964 | Hist. Tax. E. sp. nov., Hist. Tax. E. maritzae | Nativa | - |
| Elaphoglossum herminieri | (Bory ex FÈe) T. Moore | O. Vargas 1380 | Nativa | 3 | |
| Elaphoglossum latifolium | (Sw.) J. Sm. | M. Grayum 2159 | Hist. Tax. Elaphoglossum variabile | Nativa | 5 |
| Elaphoglossum nigrescens | (Hook.) T. Moore ex Diels | N. Zamora 4019 | Sin. Elaphoglossum palmense Christ, Hist. Tax. E. correae | Nativa | 3 |
| Elaphoglossum peltatum | (Sw.) Urb. | Smith 270 | Sin. Peltapteris peltata (Sw.) C. V. Morton | Nativa | 16 |
| Eleocharis elegans | (Kunth) Roem. & Schult. | B. Jacobs 2445 | Nativa | 13 | |
| Eleocharis retroflexa | (Poir.) Urb. | M. Grayum 1222 | Hist. Tax. Eleocharis acicularis | Nativa | 5 |
| Elephantopus mollis | Kunth | Hammel 8247, DUKE, LSCR. | Nativa | 4 | |
| Eleusine indica | (L.) Gaertn. | Hammel 8319 | Exótica | 12 | |
| Eleutheranthera ruderalis | (Sw.) Sch. Bip. | J. González 7723, LSCR. | Nativa | 4 | |
| Elleanthus cynarocephalus | (Rchb. f.) Rchb. f. | M. Grayum 2479 | Nativa | 4 | |
| Elleanthus graminifolius | (Barb. Rodr.) Lojtnant | Folsom 8961 | Nativa | 5 | |
| Elytrostachys clavigera | McClure | Aguilar 7636 | Nativa | 19 | |
| Emilia fosbergii | Nicolson | B. Hammel 11893, DUKE. | Nativa | 15 | |
| Emilia sonchifolia | (L.) DC. | M. Grayum 1773, DUKE. | Nativa | 10 | |
| Entada gigas | (L.) Fawc. & Rendle | O. Vargas 497, Aguilar 7855, LSCR. | Nativa | 16 | |
| Epidendrum acunae | Dressler | O. Vargas 1263 | Nativa | 15 | |
| Epidendrum angustisegmentum | (L. O. Williams) Hágsater | McDowell 630 | Sin. Epidendrum rigidum Jacq. | Nativa | 25 |
| Epidendrum baumannianum | Schltr. | Aguilar 8473 | Sin. Epidendrum hawkesii A.H. Heller | Nativa | 24 |
| Epidendrum chlorocorymbos | Schltr. | E. Castro 32 | Hist. Tax. Epidendrum difforme, Epidendrum trialatum | Nativa | 20 |
| Epidendrum ciliare | L. | B. Hammel 10601 | Nativa | 10 | |
| Epidendrum congestoides | Ames & C. Schweinf. | M. Grayum 2938 | Hist. Tax. Epidendrum schlechterianum | Nativa | - |
| Epidendrum cristatum | Ruiz & Pav. | M. Grayum 2520 | Hist. Tax. Epidendrum raniferum | Nativa | - |
| Epidendrum eburneum | Rchb. f. | E. Castro 58 | Nativa | 19 | |
| Epidendrum hunterianum | Schltr. | Aguilar 8313 | Nativa | 31 | |
| Epidendrum isomerum | Schltr. | Aguilar 8357 | Nativa | 8 | |
| Epidendrum nocturnum | Jacq. | E. Castro 8 | Nativa | 29 | |
| Epidendrum octomerioides | Schltr. | C. Todzia 1173 | Nativa | 20 | |
| Epidendrum physodes | Rchb. f. | Aguilar 8418 | Nativa | 14 | |
| Epidendrum sculptum | Rchb. f. | C. Todzia 1120 | Nativa | - | |
| Epidendrum stangeanum | Rchb. f. | E. Castro 27 | Nativa | 7 | |
| Epidendrum strobiliferum | Rchb. f. | E. Castro 56 | Nativa | 13 | |
| Epiphyllum grandilobum | (F.A.C. Weber) Britton & Rose | B. Hammel 23200 | Nativa | - | |
| Epiphyllum hookeri | Haw. | Aguilar 7874, LSCR. | Sin. E. phyllanthus (L.) Haw. var. pittieri (F. A. C. Weber) Kimnach; E. pittieri (F. A. C. Weber) Britton & Rose | Nativa | 28 |
| Epiphyllum thomasianum | (K.Schum.) Britton & Rose | J. Solomon 2474, MO. | Hist. Tax. Epiphyllum macropterum | Nativa | - |
| Episcia lilacina | Hanst. | Aguilar 7802, LSCR. | Nativa | 14 | |
| Eragrostis acutiflora | (Kunth) Nees | Judziewicz 4328 | Nativa | 8 | |
| Eragrostis pectinacea | (Michx.) Nees Reeder | R. Wilbur 63409 | Nativa | - | |
| Eragrostis tenella | (L.) P. Beauv. ex Roem. & Schult. | R. Wilbur 63181 | Sin. E. amabilis (L.) Wight & Arn. ex Nees, nom. illeg. | Exótica | 5 |
| Erechtites hieraciifolius | (L.) Raf. ex DC. | Hammel 8233, DUKE, LSCR. | Nativa | 8 | |
| Eryngium foetidum | L. | M. Grayum 1278, DUKE. | Nativa de CR Plantada en LS | 1 | |
| Erythrina cochleata | Standl. | Hammel 10973, DUKE. | Nativa | 17 | |
| Erythrina gibbosa | Cufod. | O. Vargas 585, LSCR. | Nativa | 14 | |
| Erythrina poeppigiana | (Walp.) 0. F. Cook | Hammel 11669, DUKE, MO. | Exótica | 13 | |
| Erythroxylum coca | Lam. | I. Chacón 760 | Exótica | 9 | |
| Erythroxylum fimbriatum | Peyr. | Aguilar 8175, LSCR. | Nativa | 10 | |
| Erythroxylum macrophyllum | Cav. | Hammel 8904, DUKE. | Sin. Erythroxylum lucidum Kunth | Nativa | 14 |
| Eschweilera collinsii | Pitier | Aguilar 7831, LSCR. | Sin. E. longirachis S. A. Mori, Hist. Tax. Eschweilera calyculata | Nativa | 18 |
| Eschweilera costaricensis | S. A. Mori | O. Vargas 1322, LSCR. | Nativa | 35 | |
| Etlingera elatior | (Jack) R.M. Sm. | J. González 7620 | Exótica | 9 | |
| Eucalyptus globulus | Labill. | B. Hammel 17440 | Exótica | - | |
| Eugenia acapulcensis | Steud. | B. Boyle 5295 | Nativa | - | |
| Eugenia basilaris | McVaugh | Gentry 78520 | Nativa | 8 | |
| Eugenia corusca | Barrie | Hammel 11693 | Nativa | - | |
| Eugenia hammelii | Barrie | B. Hammel 9318 | Nativa | - | |
| Eugenia hartshornii | Barrie | Hartshorn 1249, M. Grayum 2955 | Hist. Tax. E. sarapiquensis; Myrcia carnea | Nativa | 9 |
| Eugenia lithosperma | Barrie | Bawa 594 | Nativa | 14 | |
| Eugenia sarapiquensis | P.E. Sánchez | E. Salicetti 615 | Nativa | - | |
| Eugenia selvana | Barrie | Hammel 8608, J. Howard 105 | Hist. Tax. Myrciaria floribunda | Nativa | 3 |
| Eugenia stipitata | McVaugh | J. González 7714 | Exótica | 5 | |
| Eugenia uniflora | L. | B. Hammel 8608 | Exótica | 9 | |
| Euphorbia heterophylla | L. | B. Hammel 12775, DUKE, MO. | Sin. Poinsettia heterophylla (L.) Klotzsch & Garcke | Nativa | 5 |
| Euphorbia hirta | L. | J. González 6815, LSCR. | Hist. Tax. Chamaesyce hirta | Nativa | 5 |
| Euphorbia hypericifolia | L. | Hammel 8445, DUKE, LSCR. | Hist. Tax. Chamaesyce hypericifolia | Nativa | 4 |
| Euphorbia hyssopifolia | L. | R. Wilbur 39847, DUKE. | Hist. Tax. Chamaesyce hyssopifolia | Nativa | 7 |
| Euphorbia neriifolia | L. | J. González 9261, LSCR. | Exótica | 7 | |
| Euphorbia prostrata | Aiton | B. Hammel 8998, DUKE, LSCR. | Nativa | 3 | |
| Euphorbia thymifolia | L. | B. Hammel 11860, DUKE. | Hist. Tax. Chamaesyce thymifolia | Nativa | 1 |
| Euterpe oleracea | Mart. | O. Vargas 1582, LSCR. | Exótica | 14 | |
| Euterpe precatoria | Mart. | B. Hammel 11630, DUKE. | Sin. Euterpe macrospadix Oerst. | Nativa | 6 |
| Evodianthus funifer | (Poit.) Lindm. | Aguilar 7704, LSCR. | Nativa | 8 | |
| Faramea glandulosa | Poepp. & Endl. | Hammel 10992 | Sin. Faramea stenura Standl. | Nativa | 21 |
| Faramea multiflora | A. Rich. | Hammel 11040 | Sin. Faramea talamancarum Standl. | Nativa | 15 |
| Faramea parvibractea | Steyerm. | Aguilar 7827 | Nativa | 23 | |
| Faramea suerrensis | (Donn. Sm.) Donn. Sm. | Aguilar 7599 | Nativa | 15 | |
| Ferdinandusa panamensis | Standl. & L. 0. Williams | Grayum 2776 | Nativa | 21 | |
| Fevillea cordifolia | L. | Hammel 8251, DUKE, LSCR, MO. | Nativa | 25 | |
| Ficus brevibracteata | W. C. Burger | B. Hammel 10894 | Hist. Tax. Ficus turrialbana | Nativa | 11 |
| Ficus cahuitensis | C. C. Berg | B.Hammel 9541 | Nativa | 19 | |
| Ficus citrifolia | Mill. | B.Hammel 11566 | Nativa | 6 | |
| Ficus colubrinae | Standl. | Aguilar 7626 | Nativa | 20 | |
| Ficus costaricana | (Liebm.) Miq. | Aguilar 8319 | Nativa | 25 | |
| Ficus crassivenosa | W. C. Burger | Hammel 9475 | Nativa | - | |
| Ficus donnell-smithii | Standl. | Hammel 8802 | Nativa | 18 | |
| Ficus glaucescens | (Liebm.) Miq. | M.Grayum 3005 | Hist. Tax. F. maxima | Nativa | 15 |
| Ficus insipida | Willd. | Aguilar 7991 | Sin. Ficus glabrata Kunth | Nativa | 33 |
| Ficus maxima | Mill. | B. Hammel 8133 | Sin. Ficus radula Humb. & Bonpl. ex Willd., Hist. Tax. F. glaucesens (Liebm.) Miq. | Nativa | - |
| Ficus morazaniana | W.C. Burger | Hammel 9508 | Hist. Tax. Ficus velutina, F. trigonata | Nativa | 14 |
| Ficus nymphaeifolia | Mill. | Aguilar 7673 | Nativa | 10 | |
| Ficus pertusa | L. f. | B.Hammel 8138 | Nativa | 25 | |
| Ficus popenoei | Standl. | Hammel 12177 | Nativa | 6 | |
| Ficus richteri | Dugand. | G. Hartshorn 1582 | Hist. Tax. Ficus dugandii | Nativa | 10 |
| Ficus schippii | Standl. | Hammel 10880 | Nativa | 21 | |
| Ficus tonduzii | Standl. | Aguilar 8068 | Nativa | 16 | |
| Fimbristylis dichotoma | (L.) Vahl | R. Wilbur 33164 | Nativa | 4 | |
| Fimbristylis littoralis | Gaudich. | Hammel 8614 | Hist. Tax. Fimbristylis miliacea (L.) Vahl | Nativa | 8 |
| Fischeria panamensis | Spellman | Folsom 9364, DUKE, MO. | Nativa | - | |
| Fleischmannia microstemon | (Cass.) R. M. King & H. Rob. | O. Vargas 607, LSCR. | Sin. Eupatorium microstemon Cass. | Nativa | 7 |
| Fleischmannia sideritidis | (Benth.) R. M. King & H. Rob. | R. Wilbur 36976, DUKE. | Nativa | 2 | |
| Floscopa robusta | (Seub.) C. B. Clarke | Hammel 8191, DUKE, LSCR. | Nativa | 6 | |
| Forsteronia myriantha | Donn. Sm. | Hammel 8186, DUKE, LSCR, MO. | Nativa | 8 | |
| Freziera grisebachii | Krug & Urb. | A. Hurtado 002 | Nativa | 21 | |
| Fridericia chica | (Bonpl.) L.G. Lohmann | O. Vargas 1209, LSCR. | Sin. Arrabidaea chica (Bonpl.) Verl. | Nativa | 10 |
| Fridericia florida | (DC.) L.G. Lohmann | A. Gentry 78622, MO. | Sin. Arrabidaea florida DC. | Nativa | 13 |
| Fridericia schumanniana | (Loes.) L.G. Lohmann | Aguilar 7824, LSCR. | Sin. Arrabidaea verrucosa (Standl.) A.H.Gentry, Sin. Scobinaria verrucosa (Standl.) Seibert | Nativa | 10 |
| Galeottia grandiflora | A. Rich. | B. Hammel 11559 | Sin. Mendoncella grandiflora (A. Rich.) A. D. Hawkes | Nativa | 8 |
| Galinsoga quadriradiata | Ruiz & Pav. | R. Wilbur 38770, DUKE. | Nativa | 4 | |
| Garcilassa rivularis | Poepp. & Endl. | Grayum 3038, DUKE, LSCR. | Nativa | - | |
| Garcinia dulcis | (Roxb.) Kurz | O. Vargas 1664 | Exótica | 11 | |
| Garcinia intermedia | (Pittier) Hammel | Aguilar 8053 | Sin. Rheedia edulis (Seem.) Planch. & Triana | Nativa | 24 |
| Garcinia mangostana | L. | O. Vargas 1657 | Nativa | 8 | |
| Gardenia jasminoides | J. Ellis | J. González 7621 | Sin. Gardenia augusta (L.) Merr. | Exótica | 7 |
| Genipa americana | L. | Hammel 11561 | Nativa | 4 | |
| Geonoma congesta | H. Wendl. ex Spruce | Aguilar 7794, LSCR. | Nativa | 34 | |
| Geonoma cuneata | H. Wendl. ex Spruce | Aguilar 7944, LSCR. | Sin. Geonoma gracilis H. Wendl. Ex Spruce | Nativa | 29 |
| Geonoma deversa | (Poit.) Kunth | Hammel 12907, DUKE, MO. | Nativa | 6 | |
| Geonoma interrupta | (Ruiz & Pav.) Mart. | O. Vargas 1528, LSCR. | Nativa | 13 | |
| Geonoma longevaginata | H. Wendl. ex Spruce | O. Vargas 729, LSCR. | Nativa | 15 | |
| Geonoma pinnatifrons | Willd. | N. Zamora 3866, LSCR. | Hist. Tax. Geonoma oxicarpa | Nativa | 12 |
| Geophila cordifolia | Miq. | Hammel 11046 | Nativa | - | |
| Geophila macropoda | (Ruiz & Pav.) DC. | M. Grayum 1414 | Nativa | 10 | |
| Geophila repens | (L.) I. M. Johnst. | Aguilar 8162 | Nativa | 19 | |
| Gigantochloa apus | (Schult. & Schult.f.) Kurz | Judziewicz 4350 | Exótica | - | |
| Gleichenella pectinata | (Willd.) Ching | B. Hammel 11488 | Sin. Dicranopteris pectinata (Willd.) Underw.] | Nativa | 8 |
| Gliricidia sepium | (Jacq.) Kunth ex Walp. | E. Castro 4, LSCR. | Nativa de CR Plantada en LS | 21 | |
| Gloeospermum diversipetalum | L.O. Williams | Aguilar 8295 | Hist. Tax. Gloeospermum boreale | Nativa | 15 |
| Gmelina arborea | Roxb. | O. Vargas 1408, LSCR. | Exótica | 14 | |
| Gnetum leyboldii | Tul. | O. Vargas 682, LSCR. | Nativa | 38 | |
| Goeppertia cleistantha | (Standl.) Borchs. & S. Suárez | B. Hammel 9614 | Sin. Calathea cleistantha Standl. | Nativa | 9 |
| Goeppertia donnell-smithii | (K. Schum.) Borchs. & S. Suárez | B. Hammel 9630 | Sin. Calathea donnell-smithii K. Schum. | Nativa | 29 |
| Goeppertia foliosa | (Rowlee ex Woodson & Schery) Borchs. & S. Suárez | B. Hammel 11993 | Sin. Calathea foliosa Rowlee ex Woodson & Schery | Nativa | 5 |
| Goeppertia gloriana | (H. Kenn.) Borchs. & S. Suárez | Kennedy 4545 | Sin. Calathea gloriana H. Kenn., Hist. Tax. Calathea elegans | Nativa | 12 |
| Goeppertia gymnocarpa | (H. Kenn.) Borchs. & S. Suárez | Aguilar 7639 | Sin. Calathea gymnocarpa H. Kenn. | Nativa | 29 |
| Goeppertia hammelii | (H. Kenn.) Borchs. & S. Suárez | B. Hammel 9615 | Sin. Calathea hammelii H. Kenn., Hist. Tax. Calathea cuneata | Nativa | 16 |
| Goeppertia inocephala | (Kuntze) H. Kenn. & Nicolson | D. Solano 1291 | Sin. Calathea inocephala (Kuntze) H. Kenn. & Nicolson | Nativa | 11 |
| Goeppertia leucostachys | (Hook. f.) Borchs. & S. Suárez | McDowell 773 | Sin. Calathea leucostachys Hook. F. | Nativa | 11 |
| Goeppertia marantifolia | (Standl.) Borchs. & S. Suárez | R. Wilbur 33455 | Sin. Calathea marantifolia Standl. | Nativa | 8 |
| Goeppertia micans | (L. Mathieu) Borchs. & S. Suárez | O. Vargas 736 | Sin. Calathea micans (L. Mathieu) Körn. | Nativa | 10 |
| Goeppertia venusta | (H. Kenn.) Borchs. & S. Suárez | M. Grayum 2545 | Sin. Calathea venusta H. Kenn. | Nativa | 4 |
| Goeppertia warszewiczii | (L. Mathieu ex Planch.) Borchs. & S. Suárez | O. Vargas 1323 | Sin. Calathea warscewiczii (L. Mathieu ex Planch.) Planch. & Linden | Nativa | 19 |
| Goethalsia meiantha | (Donn. Sm.) Burret | O. Vargas 725 | Nativa | 44 | |
| Gomphrena serrata | L. | R. Wilbur 40182, DUKE. | Sin. Gomphrena decumbens Jacq. | Nativa | 3 |
| Gongora leucochila | Lem. | O. Vargas 1502 | Hist. Tax. Gongora quiquenervis | Nativa | 45 |
| Gongora unicolor | Schltr. | Aguilar 7584 | Nativa | 5 | |
| Gonolobus albomarginatus | (Pittier) Woodson | Grayum 2903, CAS, DUKE, F, LSCR, MO, NY. | Nativa | - | |
| Gouania hypoglauca | Standl. | O. Vargas 1790 | Nativa | 9 | |
| Gouania lupuloides | (L.) Urb. | I. Chacon 964 | Nativa | - | |
| Gouania polygama | (Jacq.) Urb. | Aguilar 8329 | Nativa | 26 | |
| Graffenrieda galeottii | (Naudin) L. 0. Williams | B.Hammel 10147 | Nativa | 17 | |
| Grevillea banksii | R. Br. | J. González 7622 | Exótica | 7 | |
| Grias cauliflora | L. | Aguilar 7961, LSCR. | Sin. Grias fendleri Seem. | Nativa | 10 |
| Guarea bullata | Radlk. | Hammel 8940 | Nativa | 11 | |
| Guarea ciliata | Al. Rodr. | O. Vargas 1068 | Sin Guarea ternifoliola sensu Coronado non C. DC. | Nativa | 6 |
| Guarea gentryi | Coronado | B. Hammel 12844 | Sin. Guarea tuerckheimii C. DC., Hist. Tax. G. guidonia | Nativa | 25 |
| Guarea grandifolia | DC. | Aguilar 7861 | Sin. G. chichon C. DC., G. pittieri C. DC. | Nativa | 23 |
| Guarea guidonia | (L.) Sleumer | O. Vargas 1223 | Sin. Guarea trichilioides L., Guarea xiroresana C. DC. | Nativa | 18 |
| Guarea hoffmanniana | C. DC. | Folsom 9843 | Sin. Guarea macropetala T. D. Penn. | Nativa | - |
| Guarea kegelii | Turcz | G. S. Hartshorn 1332, 1450, 1556 | Sin. Guarea bijuga C. DC. | Nativa | - |
| Guarea pilosa | Al. Rodr. | Aguilar 8421 | Hist. Tax. Guarea tonduzii, Guarea chiricana | Nativa | 18 |
| Guarea rhopalocarpa | Radlk. | Aguilar 8109 | Sin. G. tuisana C. DC. | Nativa | 52 |
| Guatteria aeruginosa | Standl. | O. Vargas 726, LSCR. | Nativa | 15 | |
| Guatteria amplifolia | Triana & Planch. | Aguilar 8206, LSCR. | Sin. Guatteria diospyroides Baill., Guatteria inuncta R. E. Fr., Sin. Guatteria platypetala R. E. Fr. | Nativa | 25 |
| Guatteria ucayalina | Huber | B.Hammel 11605, LSCR. | Sin. Guatteria recurvisepela R.E.Fr. | Nativa | - |
| Gurania coccinea | Cogn. | Aguilar 8220, LSCR. | Sin. G. costaricensis Cogn. | Nativa | 16 |
| Gurania makoyana | (Lem.) Cogn. | Aguilar 7643, LSCR. | Sin. Gurania levyana Cogn. | Nativa | 26 |
| Guzmania desautelsii | Read & L. B. Sm. | B. Hammel 12308 | Sin. Guzmania erythrolepis Brongn. ex Planch. | Nativa | - |
| Guzmania lingulata | (L.) Mez | Aguilar 7595 | Nativa | 8 | |
| Guzmania monostachia | (L.) Rusby ex Mez | Aguilar 7612 | Nativa | 21 | |
| Guzmania scherzeriana | Mez | Hammel 8927 | Nativa | 5 | |
| Gymnosiphon sp. A | ? | Folsom 9250, 9887 | Nativa | - | |
| Gynerium sagittatum | (Aubl.) P. Beauv. | B.Hammel 11002 | Nativa | 10 | |
| Hamelia axillaris | Sw. | Jacobs 3277, O. Vargas 2076 | Nativa | 9 | |
| Hamelia patens | Jacq. | D. Solano 1142 | Nativa | 27 | |
| Hamelia xerocarpa | Kuntze | Hammel 8610 | Nativa | 14 | |
| Hampea appendiculata | (Donn. Sm.) Standl. | Grayum 2960 | Nativa | 14 | |
| Hanburia oerstedii | (Cogn.) H. Schaef. & S.S. Renner | Jacobs 3170, DUKE. | Sin. Elateriopsis oerstedii (Cogn.) Pittier | Nativa | - |
| Handroanthus chrysanthus | (Jacq.) S. O. Grose | Jacobs 3036, DUKE, M O. | Sin. Tabebuia chrysantha | Nativa | 21 |
| Handroanthus guayacan | (Seem.) S. O. Grose | O. Vargas 1673, LSCR. | Sin. Tabebuia guayacan | Nativa | 6 |
| Hasseltia floribunda | Kunth | Hammel 8644 | Nativa | 26 | |
| Hebeclinium macrophyllum | (L.) DC. | Hammel 9957, DUKE, LSCR. | Sin. Eupatorium macrophyllum L. | Nativa | - |
| Hecistopteris pumila | (Spreng.) J. Sm. | M. Grayum 2174 | Nativa | 4 | |
| Hedychium coronarium | J. Koenig | E. Castro 0017 | Exótica | 16 | |
| Hedyosmum scaberrimum | Standl. | Hammel 8181, DUKE, MO. | Hist. Tax. H. callososerratum | Nativa | 16 |
| Heisteria concinna | Standl. | Aguilar 8336 | Nativa | 5 | |
| Heisteria macrophylla | Oerst. | McDowell 163 | Nativa | 4 | |
| Heisteria scandens | Ducke | B.Hammel 9055 | Nativa | 19 | |
| Heliconia cf. stricta | Huber | O. Vargas 2056 | Exó´©£a | 12 | |
| Heliconia imbricata | (Kuntze) Baker | D. Smith 1271 | Nativa | 11 | |
| Heliconia irrasa | Lane ex R. R. Sm. | R. L. Wilbur 30223 | Nativa | 1 | |
| Heliconia latispatha | Benth. | O. Vargas 1242 | Nativa | 10 | |
| Heliconia latispatha X imbricata | ? | O. Vargas 1533 | Nativa | 6 | |
| Heliconia longa | Petersen | B. Hammel 11459 | Hist. Tax. Heliconia curtispatha | Nativa de CR Plantada en LS ? | 4 |
| Heliconia mariae | Hook. f. | Kress 79-1104 | Nativa | 17 | |
| Heliconia mathiasiae | G. S. Daniels & F. G. Stiles | Kress 76-593 | Sin. Heliconia vaginalis Benth. | Nativa | 6 |
| Heliconia pogonantha | Cufod. | Kress 76-523 | Nativa | 24 | |
| Heliconia psittacorum | Sessé & Moc. | J. González 8276 | Exótica | 5 | |
| Heliconia sarapiquensis | G. S. Daniels & F. G. Stiles | R. Wilbur 33244 | Nativa | 13 | |
| Heliconia trichocarpa | G. S. Daniels & F. G. Stiles | M. Grayum 2214 | Nativa | 8 | |
| Heliconia umbrophila | G. S. Daniels & F. G. Stiles | O. Vargas 1270 | Nativa | 8 | |
| Heliconia vaginalis | Benth. | Sin. Heliconia deflexa G. S. Daniels & F. G. Stiles | Nativa | 7 | |
| Heliconia wagneriana | Petersen | Aguilar 8435 | Nativa | 21 | |
| Heliocarpus appendiculatus | Turcz. | Aguilar 8310 | Nativa | 36 | |
| Heliotropium indicum | L. | Hammel 8737, DUKE. | Nativa | 10 | |
| Hellenia speciosa | (J. Koenig) Govaerts | O. Vargas 1288 | Sin. Costus speciosus (K. D. Koenig) Sm., Sin. Cheilocostus speciosus (J.Koenig) C.D.Specht | Exótica | 7 |
| Hemidictyum marginatum | (L.) C. Presl | M. Grayum 1331 | Nativa | - | |
| Hemionitis palmata | L. | O. Vargas 1205 | Nativa | 7 | |
| Henriettea tuberculosa | (Donn. Sm.) L. O. Williams | Aguilar 7709 | Sin. Henriettella tuberculosa Donn. Sm. | Nativa | 10 |
| Hernandia didymantha | Donn. Sm. | Aguilar 7656, LSCR. | Nativa | 27 | |
| Hernandia stenura | Standl. | Hammel 10690, DUKE. | Nativa | 18 | |
| Herpetacanthus panamensis | Leonard | Hammel 9544, DUKE, MO. | Sin. Standleyacanthus costaricensis Leonard | Nativa | 9 |
| Herrania purpurea | (Pittier) R. E. Schult. | Aguilar 8248 | Nativa | 25 | |
| Heteranthera reniformis | Ruiz & Pav. | O. Vargas 1164 | Nativa | 12 | |
| Heterocondylus vitalbae | (DC.) R. M. King & H. Rob. | Hammel 8003, DUKE, LSCR. | Sin. Eupatorium vitalbae DC | Nativa | 8 |
| Heteropsis oblongifolia | Kunth | Aguilar 7856 | Nativa | 13 | |
| Heteropterys laurifolia | (L.) A. Juss. | B. Hammel 8602 | Nativa | 16 | |
| Heteropterys macrostachya | A. Juss. | O. Vargas 1381 | Nativa | 16 | |
| Heteropterys panamensis | Cuatr. & Croat | P. Foster 1180 | Nativa | 18 | |
| Heterotaxis discolor | (G. Lodd. ex Lindl.) Ojeda & Carnevali | J. González 11340 (LSCR) | Nativa | 21 | |
| Hevea brasiliensis | (Willd. ex A. Juss.) Müll. Arg. | O. Vargas 1395, LSCR. | Exótica | 6 | |
| Hibiscus mutabilis | L. | J. González 7651 | Exótica | 7 | |
| Hibiscus rosa-sinensis | L. | J. González 7650 | Exótica | 5 | |
| Hieronyma alchorneoides | Allemão | Aguilar 8166 | Sin. Hieronyma laxiflora (Tul.) Müll. Arg. ??? | Nativa | 21 |
| Hieronyma oblonga | (Tul.) Müll. Arg. | Aguilar 8197 | Nativa | 13 | |
| Hillia grayumii | C. M. Taylor | M. Grayum 2793 | Nativa | 6 | |
| Hillia triflora | (Oerst.) C. M. Taylor | Folsom 10044 | Nativa | - | |
| Hippobroma longiflora | (L.) G. Don | Hammel 8906, DUKE. | Nativa | 21 | |
| Hippotis panamensis | (Dwayer) C. M. Taylor | Hammel 11032 | Hist. Tax. Hippotis albiflora | Nativa | 14 |
| Hiraea fagifolia | (DC.) A. Juss. | Aguilar 7683 | Nativa | 23 | |
| Hiraea reclinata | Jacq. | R. Kriebel 4002 | Nativa | - | |
| Hiraea smilacina | Standl. | O. Vargas 1723, B. Hammel 9340 | Nativa | 8 | |
| Hirtella lemsii | L. 0. Williams & Prance | Aguilar 8104, LSCR. | Nativa | 27 | |
| Hirtella media | Standl. | O. Vargas 1271, LSCR. | Nativa | 5 | |
| Hoffmannia liesneriana | L. 0. Williams | Hammel 9331 | Sin. Hoffmannia boraginoides Dwyer ined. | Nativa | 21 |
| Hoffmannia valerioi | Standl. | Hammel 9513 | Hist. Tax. Hoffmannia inamoena Standl. | Nativa | - |
| Homolepis aturensis | (Kunth) Chase | M. Grayum 1419 | Nativa | 11 | |
| Huperzia dichaeoides | (Maxon) Holub | Folsom 9509 | Sin. Lycopodium dichaeoides Maxon | Nativa | - |
| Huperzia dichotoma | (Jacq.) Trevis. | Hammel 10674 | Sin. Lycopodium dichotomum Jacq. | Nativa | 2 |
| Huperzia linifolia | (L.) Trevis. | Hammel 10598 | Sin. Lycopodium linifolia L. | Nativa | 5 |
| Hura crepitans | L. | Aguilar 7810, LSCR. | Nativa | 36 | |
| Hybanthus denticulatus | H. E. Ballard, Wetter & N. Zamora | Aguilar 8490 | Nativa de CR Plantada en LS ? | 12 | |
| Hydrocotyle leucocephala | Cham. & Schltdl. | O. Vargas 1515, LSCR. | Hist. Tax. H. mexicana | Nativa | 9 |
| Hydrocotyle umbellata | L. | R. Wilbur 66911, DUKE. | Nativa | 8 | |
| Hydrocotyle verticillata | Thunb. | M. Grayum 2145, DUKE. | Sin. Hydrocotyle prolifera Kellog | Nativa | - |
| Hygrophila costata | Nees | Hammel 8356, DUKE. | Sin. Hygrophylla guinanensis Nees, Sin. Hygrophylla conferta Nees | Nativa | 18 |
| Hylocereus stenopterus | (F.A.C. Weber) Britton & Rose | O. Vargas & Tschapka 1118, LSCR. | Nativa | 7 | |
| Hymenachne amplexicaulis | (Rudge) Nees | Hammel 8230, T. McDowell 266 | Nativa | 7 | |
| Hymenachne donacifolia | (Raddi) Chase | Hammel 8230A | Nativa | - | |
| Hymenandra squamata | (Lundell) Pipoly & Ricketson | Aguilar 7793 | Sin. Ardisia squamata (Lundell) J. F. Morales | Nativa | 15 |
| Hymenandra stenophylla | (Donn. Sm.) Pipoly & Ricketson | Jacobs 2917 | Sin. Ardisia stenophylla Donn. Sm., Sin H. wilburiana (Lundell) Pipoly & Ricketson | Nativa | 23 |
| Hymenocallis littoralis | (Jacq.) Salisb. | McDowell 216, DUKE | Hist. Tax. H. schraderianum | Nativa de CR Plantada en LS | 6 |
| Hymenolobium mesoamericanum | H. C. Lima | O. Vargas 572, LSCR. | Hist. Tax. Hymenolobium pulcherrimum | Nativa | 11 |
| Hymenophyllum abruptum | Hook. | M. Grayum 2173 | Sin. Hymenophyllum brevifrons Kunze | Nativa | - |
| Hymenophyllum fragile | (Hedw.) C.V. Morton | B. Hammel 10924 | Nativa | - | |
| Hymenophyllum hirsutum | (L.) Sw. | M. Grayum 1780 | Nativa | 5 | |
| Hymenophyllum maxonii | H. Christ ex C. V. Morton | M. Grayum 2253 | Nativa | 4 | |
| Hymenophyllum polyanthos | (Sw.) Sw. | M. Grayum 2160 | Nativa | - | |
| Hyparrhenia rufa | (Nees) Stapf | McDowell 955 | Exótica | 10 | |
| Hypolepis hostilis | (Kunze) C. Presl | Aguilar 8010 | Nativa | 22 | |
| Hypolepis repens | (L.) C. Presl | M. Grayum 2417 | Nativa | 6 | |
| Hypolytrum longifolium | (Rich.) Nees | B. Hammel 10911 | Hist. Tax. Hypolytrum schraderianum | Nativa | - |
| Hyptis brevipes | Poit. | Folsom 10023, DUKE, MO. | Nativa de CR Plantada en LS ? | 3 | |
| Hyptis capitata | Jacq. | Aguilar 8268, LSCR. | Nativa | 21 | |
| Hyptis obtusiflora | C. Presl ex Benth. | Grayum 2988, DUKE, LSCR, MO. | Nativa | 2 | |
| Hyptis vilis | Kunth & C. D. Bouché | B.Hammel 11069, DUKE, LSCR. | Hist. Tax. Hyptis brevipes | Nativa | 4 |
| Ichnanthus nemorosus | (Sw.) Döll | O. Vargas 1628 | Nativa | 4 | |
| Ichnanthus pallens | (Sw.) Munro ex Benth. | Hammel 8031 | Sin. Ichnanthus axillaris (Nees) Hitchc. & Chase | Nativa | 6 |
| Ilex skutchii | Edwin ex T. R. Dudley & W. J. Hahn | O. Vargas 720,LSCR. | Nativa | 25 | |
| Impatiens balsamina | L. | B. Hammel 8774, DUKE. | Exótica | 2 | |
| Impatiens walleriana | Hook. f. | R. Wilbur 37534, DUKE. | Exótica | 4 | |
| Indigofera trita | L. f. | R. Wilbur 38744, DUKE. | Sin. Indigofera jamaicensis Spreng. | Nativa | - |
| Inga acuminata | Benth. | Hammel 13084, DUKE. | Nativa | 4 | |
| Inga alba | (Sw.) Willd | B.Hammel 9846, DUKE. | Hist. Tax. Inga longispica | Nativa | 25 |
| Inga chocoensis | Killip ex T. S. Elias | K. Bawa 544, MO. | Sin. Inga coprocarpa N. Zamora & Poveda | Nativa | 10 |
| Inga cocleensis | Pittier | B.Hammel & J.Fraser 11096, DUKE. | Nativa | 22 | |
| Inga coruscans | Humb. & Bonpl. ex Willd. | Jacobs 2784, DUKE. | Nativa | - | |
| Inga densiflora | Benth. | Hammel 9847, DUKE. | Nativa | 15 | |
| Inga edulis | Mart. | O. Vargas 1886, LSCR. | Exótica | 18 | |
| Inga jinicuil | Schltdl. & Cham ex G. Don | B.Hammel 11571, DUKE, MO. | Sin. Inga paterno Harms | Nativa | 15 |
| Inga leiocalycina | Benth. | B.Hammel 12960, DUKE. | Hist. Tax. Inga coruscans | Nativa | 24 |
| Inga marginata | (Vell.) Mart. | Aguilar 7685, LSCR. | Nativa | 13 | |
| Inga mortoniana | Jorge León | Hammel 9694, DUKE, MO. | Hist. Tax. Inga acrocephala | Nativa | 4 |
| Inga nobilis | Willd. | G. Hartshorn 1326, DUKE. | Sin. Inga quaternata Poepp. | Nativa | - |
| Inga oerstediana | Benth. ex Seem. | Aguilar 7682, LSCR. | Nativa | 9 | |
| Inga pezizifera | Benth. | Hammel 11033, LSCR. | Sin. Inga riopalenquensis A. H. Gentry | Nativa | 13 |
| Inga ruiziana | G. Don | Hammel 9664, DUKE. | Nativa | 7 | |
| Inga samanensis | Uribe | O. Vargas 1382, LSCR. | Sin. Inga squamigera Jorge León | Nativa | 15 |
| Inga sapindoides | Willd. | Aguilar 8074, LSCR. | Nativa | 28 | |
| Inga sertulifera | DC. | Hammel 10652, DUKE. | Hist. Tax. Inga heterophylla | Nativa | 13 |
| Inga spectabilis | (Vahl) Willd. | O. Vargas 1540, LSCR. | Nativa de CR Plantada en LS ? | 37 | |
| Inga thibaudiana | DC. | Hammel 9711, DUKE. | Nativa | 8 | |
| Inga tonduzii | Donn. Sm. | B.Hammel & J.Trainer 13020, DUKE. | Nativa | 18 | |
| Inga umbellifera | (Vahl) Steud. | B.Hammel 10711, DUKE, MO. | Nativa | 16 | |
| Inga venusta | Standl. | B. Hammel 11658, DUKE. | Sin. Inga callicarpa N. Zamora, Inga urabensis L. Uribe | Nativa | 12 |
| Ionopsis satyrioides | (Sw.) Rchb. f. | Attwood 85-73 | Nativa | 4 | |
| Ionopsis utricularioides | (Sw.) Lindl. | Aguilar 8463 | Nativa | 23 | |
| Ipomoea alba | L. | Aguilar 8244, LSCR. | Sin. Ipomoea bona-nox L., Sin. Calonyction bona-nox (L.) Bojer, Sin. Convolvulus aculeatus L. | Nativa | 38 |
| Ipomoea batatas | (L.) Poir. | M. Grayum 2671, DUKE. | Nativa | - | |
| Ipomoea batatoides | Choisy | Hartshorn 1065, DUKE, LSCR, MO. | Nativa | - | |
| Ipomoea philomega | (Vell.) House | Aguilar 7984, LSCR. | Nativa | 32 | |
| Ipomoea quamoclit | L. | R. L. Wilbur 63231, DUKE. 63476, 64552. | Sin. Quamoclit pennata (Desr.) Bojer | Nativa de CR Plantada en LS | 7 |
| Ipomoea squamosa | Choisy | Aguilar 7591, LSCR. | Nativa | 8 | |
| Ipomoea tiliacea | (Willd.) Choisy | Aguilar 8433, LSCR. | Nativa | 27 | |
| Ipomoea trifida | (Kunth) G. Don | I. Chacon 489, MO. | Nativa | 17 | |
| Iresine diffusa | Humb. & Bonpl. ex Willd. | Hammel 8145, DUKE, LSCR. | Sin. Iresine celosia L. | Nativa | 6 |
| Iriartea deltoidea | Ruiz & Pav. | Aguilar 7697, LSCR. | Sin. Iriartea gigantea H. Wendl. Ex Burret | Nativa | 38 |
| Ischaemum timorense | Kunth | R. Wilbur 38251 | Hist. Tax. Ischaemum indicum | Exótica | 12 |
| Ischnosiphon elegans | Standl. | B. Hammel 10083 | Nativa | 14 | |
| Ischnosiphon inflatus | L. Andersson | O. Vargas 1560 | Nativa | 14 | |
| Isertia haenkeana | DC. | R. Aguilar 8731 | Nativa | 17 | |
| Ixophorus unisetus | (J. S. Presl) Schltdl. | Hammel 8779 | Nativa | 18 | |
| Ixora nicaraguensis | Wernham | Hartshorn 1597 | Nativa | 16 | |
| Jacaranda copaia | (Aubl.) D. Don | B.Hammel 11447, DUKE, F, MO. | Nativa | 9 | |
| Jacaratia dolichaula | (Donn. Sm.) Woodson | Aguilar 7646, LSCR. | Nativa | 37 | |
| Jacaratia spinosa | (Aubl.) DC. | Hammel 11081, DUKE, LSCR, MO. | Sin. Jacaratia costaricensis I. M. Johnst. | Nativa | 15 |
| Jacquiniella globosa | (Jacq.) Schltr. | E. Castro 38 | Nativa | 5 | |
| Jaegeria hirta | (Lag.) Less. | B. Hammel 12453, DUKE. | Nativa | 3 | |
| Jatropha gossypiifolia | L. | M. Grayum 1808, DUKE, MO. | Exótica | 13 | |
| Jatropha integerrima | Jacq. | Folsom 9939, DUKE. | Exótica | 6 | |
| Jubelina wilburii | W. R. Anderson | Aguilar 7884 | Nativa | 20 | |
| Justicia aurea | Schltdl. | Folsom 8724, DUKE, MO. | Nativa | 11 | |
| Justicia comata | (L.) Lam. | Aguilar 8273, LSCR. | Nativa | 17 | |
| Justicia pectoralis | Jacq. | M. Grayum 1799, DUKE. | Nativa | 3 | |
| Justicia refractifolia | (Kuntze) Leonard | B. Hammel 7738, DUKE, MO. | Nativa | 20 | |
| Justicia sarapiquensis | McDade | D. Solano 1422, LSCR. | Nativa | 4 | |
| Justicia trichotoma | (Kuntze) Leonard | Aguilar 7772, LSCR. | Nativa | 5 | |
| Kaempferia rotunda | L. | O. Vargas 1552 | Exótica | 25 | |
| Kefersteinia costaricensis | Schltr. | Dressler 6150 | Nativa | 15 | |
| Kegeliella kupperi | Mansf. | Folsom 9605 | Hist. Tax. K. atropilosa sensu Atwood, 1988 | Nativa | - |
| Kigelia africana | (Lam.) Benth. | J. González 8642, LSCR. | Sin. Kigelia pinnata (Jacq.) DC. | Exótica | 3 |
| Klaprothia fasciculata | (C. Presl) Poston | J. González 6821, LSCR. | Sin. Sclerothrix fasciculata C. Presl | Nativa | 7 |
| Koanophyllon hylonomum | (B. L. Rob.) R. M. King & H. Rob. | Aguilar 7583, LSCR. | Nativa | 5 | |
| Kohleria spicata | (Kunth) Oerst. | Wilbur 64140, DUKE. | Nativa | 2 | |
| Kyllinga brevifolia | Rottb. | Jacobs 2197 | Sin. Cyperus brevifolius (Rottb.) Hassk. | Nativa | - |
| Kyllinga pumila | Michx. | Hammel 8318 | Sin. Cyperus densicaespitosus Mattf. & Kük. | Nativa | 4 |
| Lacistema aggregatum | (P.J. Bergius) Rusby | Hammel 8012, DUKE. | Nativa | 28 | |
| Lacmellea panamensis | (Woodson) Markgr. | O. Vargas 1327, LSCR. | Nativa | 22 | |
| Lacunaria crenata | (Tul.) A.C. Sm. | Hammel 8104 | Sin. Lacunaria panamensis (Standl.) Standl. | Nativa | 13 |
| Ladenbergia heterophylla | (Wedd.) Standl. | Hammel 10970 | Sin. Ladenbergia sericophylla Standl.? | Nativa | - |
| Laetia procera | (Poepp.) Eichler | G. Hartshorn 1049 | Nativa | 38 | |
| Lagerstroemia speciosa | Pers. | O. Vargas 1136, LSCR. | Exótica | 13 | |
| Lankesteriana barbulata | (Lindl.) Karremans | K. Richardson 95 (INB) | Sin. Anathalis barbulata (Lindl.) Pridgeon & M.W. Chase, Sin. Pleurothallis barbulata Lindl., Sin. Humboltia barbata (H. Focke) Kuntze, Sin. Humboldtia barbulata (Lindl.) Kuntze, Sin. Panmorphia barbulata (Lindl.) Luer, Specklinia barbulata (Lindl.) Luer | Nativa | - |
| Lantana camara | L. | G. Vargas 1193 (CR, USJ) | Exótica | 3 | |
| Lantana trifolia | L. | Hammel 8235 (LSCR, DUKE) | Nativa | 6 | |
| Laportea aestuans | (L.) Chew | O. Vargas 1518 | Sin. Fleurya aestuans (L.) Miq. | Nativa | 10 |
| Lasiacis oaxacensis | (Steud.) Hitchc. | Hammel 8479 | Nativa | - | |
| Lasiacis scabrior | Hitchc. | Hammel 8336 | Nativa | - | |
| Lasianthaea fruticosa | (L.) K. M. Becker | Hammel 8139, DUKE. | Sin. Zexmenia frutescens (Mill.) S. F. Blake | Nativa | 4 |
| Lasianthus panamensis | (Dwyer) Robbr | Hammel 13082 | Sin. Dressleriopsis panamensis Dwyer | Nativa | 15 |
| Leandra dichotoma | (Pav. ex D. Don) Cogn. | Aguilar 7712 | Nativa | - | |
| Leandra granatensis | Gleason | B.Hammel 9663 | Sin. Leandra strigosa Gleason | Nativa | 15 |
| Leandra grandifolia | Cogn. | Hammel 8226 | Nativa | 11 | |
| Leandra longicoma | Cogn. | Aguilar 8018 | Nativa | 25 | |
| Leandra mexicana | (Naudin) Cogn. | Nativa | 10 | ||
| Lecythis ampla | Miers | B. Hammel 12077, DUKE, MO. | Nativa | 51 | |
| Leochilus labiatus | (Sw.) Kuntze | Attwood 85072 | Nativa | 25 | |
| Lepanthes blepharistes | Rchb. f. | M. Grayum 2778 | Nativa | - | |
| Lepidaploa salzmannii | (DC.) H.Rob. | J. González 11606, LSCR. | Nativa | - | |
| Leptochloa scabra | Nees | J. González 9034 | Exótica | 3 | |
| Leretia cordata | Vell. | M. Molina BTTP74, DUKE. | Hist. Tax. Casimirella ampla | Nativa | 14 |
| Leucaena multicapitula | Schery | Aguilar 8214, LSCR. | Nativa de CR Plantada en LS | 13 | |
| Licania affinis | Fritsch | B.Hammel 12476, DUKE, MO. | Nativa | 15 | |
| Licania arachicarpa | N. Zamora | Aguilar 7603, LSCR. | Hist. Tax. Licania glabriflora, Licania sp. A | Nativa | 33 |
| Licania belloi | Prance | O. Vargas 1679, LSCR. | Nativa de CR Plantada en LS | 7 | |
| Licania hypoleuca | Benth. | Hammel 11048, DUKE, MO. | Nativa | 4 | |
| Licania platypus | (Hemsl.) Fritsch | M. Grayum 9448, DUKE, MO. | Nativa | - | |
| Licaria misantlae | (Brandegee) Kosterm. | B. Hammel 10670, DUKE, LSCR, MO. | Hist. Tax. Licaria sp. A de Flora Costarricensis y sp. nov. de listas anteriores | Nativa | 7 |
| Licaria sarapiquensis | Hammel | G. Hartshorn 1588, DUKE, LSCR, MO. | Sin. Licaria debilis Hammel, Hist. Tax. Licaria guatemalensis | Nativa | 7 |
| Licaria sp. 1 | ? | B. Hammel 11036, DUKE, MO. | Hist. Tax. Licaria tiandra, Licaria sp. A | Nativa | 4 |
| Lindsaea lancea | (L.) Bedd. | B. Hammel 10279 | Nativa | 5 | |
| Lindsaea quadrangularis | Raddi | Hammel 10967 | Nativa | 4 | |
| Lipocarpha micrantha | (Vahl) G. C. Tucker | R. Wilbur 63465 | Sin. Hemicarpha micrantha (Vahl) Pax | Nativa | - |
| Lisianthius skinneri | (Hemsl.) Kuntze | Jacobs 3056, DUKE. | Nativa | 3 | |
| Lithachne pauciflora | (Sw.) P. Beauv. | Hammel 11075 | Nativa | - | |
| Lomariopsis japurensis | (Mart.) J. Sm. | M. Grayum 982 | Nativa | 17 | |
| Lomariopsis vestita | E. Fourn. | Hammel 10714 | Hist. tax. Lomariopsis fendleri D. C. Eaton | Nativa | 20 |
| Lomariopsis xfarrarii | R. C. Moran & E. Watkins | R. Moran 6691 | Nativa | - | |
| Lonchitis hirsuta | L. | M. Grayum 1063 | Nativa | 9 | |
| Lonchocarpus ferrugineus | M. Sousa | B.Hammel 11537, MO. | Hist. Tax. Lonchocarpus velutinus Benth. | Nativa | 12 |
| Lonchocarpus heptaphyllus | (Poir.) DC. | Hammel 10934, DUKE. | Sin. L. pentaphyllus (Poir.) Kunth ex DC.; L. latisiliquus M. Sousa | Nativa | 21 |
| Lonchocarpus oliganthus | F. J. Herm. | Aguilar 8014, LSCR. | Nativa | 17 | |
| Lophanthera hammelii | W. R. Anderson | B. Hammel 9397 | Nativa | 19 | |
| Louteridium costaricense | Radlk. & Donn. Sm. | B. Hammel 13226, DUKE, MO. | Nativa | 9 | |
| Lozania pittieri | (S. F. Blake) L. B. Sm. | Hammel 8260, DUKE, MO. | Sin. Lozania pedicellata (Standl.) L. B. Sm. | Nativa | 17 |
| Ludovia integrifolia | (Woodson) Harling | Hammel 8205, LSCR, MO. | Nativa | 16 | |
| Ludwigia affinis | (DC.) H. Hara | O. Vargas 1134 | Nativa | 19 | |
| Ludwigia decurrens | Walter | Hammel 8236 | Sin. Jussiaea decurrens (Walt.) DC. | Nativa | 3 |
| Ludwigia erecta | (L.) H. Hara | R. Wilbur 38329 | Sin. Jussiaea erecta L. | Nativa | 3 |
| Ludwigia hyssopifolia | (G. Don) Exell | J. González 9046 | Nativa | 2 | |
| Ludwigia latifolia | (Benth.) Hara | Hammel 8234 | Sin. Jussiaea latifolia Benth. | Nativa | 22 |
| Ludwigia leptocarpa | (Nutt.) Hara | B. Hammel 12164 | Sin. Jussiaea leptocarpa Nutt. | Nativa | - |
| Ludwigia octovalvis | (Jacq.) P. H. Raven | J. González 7761 | Sin. Jussiaea suffruticosa L. | Nativa | 6 |
| Ludwigia peruviana | (L.) Hara | T. McDowell 218 | Sin. Jussiaea peruviana L. | Nativa | 7 |
| Luehea seemannii | Triana & Planch. | Hammel & Trainer 13016 | Nativa | 22 | |
| Luffa aegyptiaca | Mill. | T. Mowbray 1307, DUKE. | Exótica | 6 | |
| Lundia puberula | Pittier | O. Vargas 1680, LSCR. | Nativa | 22 | |
| Lycianthes heteroclita | (Sendtn.) Bitter | Aguilar 8060 | Hist. Tax. Lycianthes synanthera | Nativa | 12 |
| Lycianthes multiflora | Bitter | Hammel 8283? | Nativa | 10 | |
| Lycianthes sanctaeclarae | (Greenm.) D'Arcy | Hammel 9622 | Nativa | 8 | |
| Lycopodiella cernua | (L.) Pic. Serm. | Hammel 8360 | Sin. Lycopodium cernuum L. | Nativa | 11 |
| Mabea occidentalis | Bernh. | Hammel 8298, DUKE, LSCR. | Nativa | 18 | |
| Machaerium floribundum | Benth. | G. Hartshorn 1784, MO. | Nativa | 1 | |
| Machaerium isadelphum | (E. Mey.) Amshoff | B. Hammel 11515, DUKE. | Nativa | - | |
| Machaerium seemannii | Benth. ex Seem. | Aguilar 8203, LSCR. | Nativa | 9 | |
| Macrolobium costaricense | W.C. Burger | B.Hammel 9728, DUKE. | Hist. Tax. M. taylorii | Nativa | 7 |
| Macrothelypteris torresiana | (Gaudich.) Ching | Hammel 10668 | Sin. Thelypteris torresiana (Gaudich.) Alston | Exótica | 10 |
| Magnolia costaricensis | A.Vázquez | B.Hammel 10985, DUKE. | Hist. Tax. Talauma sp. A, Hist. Tax. Talauma sambuensis cf. | Nativa | 14 |
| Magnolia inbioana | A.Vázquez | B.Hammel 13083 | Sin. Talauma gloriensis Pittier | Nativa | 30 |
| Malachra alceifolia | Jacq. | M. Grayum 2137 | Nativa | 16 | |
| Malvaviscus arboreus | Cav. | B. Jacobs 2975 | Nativa | 3 | |
| Malvaviscus concinnus | Kunth | M. Grayum 2333 | Hist. Tax. Malvaviscus arboreus | Nativa | 6 |
| Mandevilla hirsuta | (Rich.) K. Schum. | Aguilar 8486, LSCR. | Nativa | 23 | |
| Mandevilla villosa | (Miers) Woodson | B. Hammel 13242, DUKE. | Nativa | 8 | |
| Manekia incurva | (Sieber ex Schult.) T. Arias, Callejas & Bornst. | Grayum 2864 | Sin. Manekia naranjoana (C. DC.) Callejas ex N. Zamora, Hammel & Grayum, Sin. Sarcorhachis naranjoana (C. DC.) Trel. | Nativa | 10 |
| Manettia longipedicellata | C. M. Taylor | Hammel 8099 | Nativa | 22 | |
| Mangifera indica | L. | O. Vargas 1521, LSCR. | Exótica | 10 | |
| Manihot brachyloba | Müll. Arg. | Hammel 8982, DUKE, LSCR, MO. | Nativa | 4 | |
| Manihot esculenta | Crantz | Hammel 10047, DUKE. | Exótica | 6 | |
| Manilkara zapota | (L.) P. Royen | J. González 9246 | Nativa de CR Plantada en LS | 2 | |
| Mansoa standleyi | (Steyerm.) A. H. Gentry | O. Vargas 580, LSCR. | Sin. Pachyptera standleyi (Steyerm.) A. H. Gentry | Nativa | 1 |
| Mapania assimilis | T. Koyama | M. Grayum 364 | Nativa | 5 | |
| Maquira guianensis | Aubl. | Hammel 11587 | Sin. Maquira costaricana (Standl.) C. C. Berg, Sin. Perebea costaricana Standl. | Nativa | 11 |
| Maranthes panamensis | (Standl.) Prance & F. White | Aguilar 8169, LSCR. | Sin. Couepia panamensis Satndl. | Nativa | 33 |
| Marathrum minutiflorum | Engl. | O. Vargas 1686 | Sin. Marathrum allenii Woodson | Nativa | 24 |
| Marcgravia cf. brownei | (Triana & Planch.) Krug & Urb. | R. Aguilar 8208 (LSCR) | Hist. Tax. Marcgravia serrae | Nativa | 15 |
| Marcgravia mexicana | Gilg | J. González 8616 (LSCR) | Hist. Tax. Marcgravia serrae | Nativa | 5 |
| Marcgravia nepenthoides | Seem. | B. Hammel 11701 | Nativa | 38 | |
| Marcgravia nervosa | Triana & Planch | B. Hammel 8032 | Sin. Marcgravia membranacea Standl. | Nativa | 17 |
| Marcgraviastrum subsessile | (Benth.) Bedell | O. Vargas 1069 | Sin. Norantea subsessilis (Benth.) Donn. Sm. | Nativa | 5 |
| Margaritopsis haematocarpa | Standl. | Aguilar 7920 | Sin, Psychotria haematocarpa Standl. | Nativa | 11 |
| Marila laxiflora | Rusby | Hammel 11520 | Sin. Marila verapazensis Donn. Sm. | Nativa | 5 |
| Marila pluricostata | Standl. & L. O. Williams | Hammel & Trainer 10798 | Nativa | 18 | |
| Maripa nicaraguensis | Hemsl. | Hammel 11594, DIKE, LSCR. | Nativa | 36 | |
| Marsypianthes chamaedrys | (Vahl) Kuntze | Hammel 9212, DUKE, LSCR, MO. | Nativa | 4 | |
| Martinella obovata | (Kunth) Bureau & K. Schum. | A. Gentry 78642, MO. | Nativa | 16 | |
| Mascagnia vacciniifolia | Nied. | O. Vargas 504 | Nativa | 25 | |
| Masdevallia attenuata | Rchb. f. | J. González 11339 (LSCR) | Nativa | 11 | |
| Masdevallia tubuliflora | Ames | D. Smith 544 | Nativa | 15 | |
| Matelea cynanchiflora | Woodson | Grayum 2996, DUKE, LSCR. | Nativa | - | |
| Matelea denticulata | (Vahl) Fontella & E. A. Schwarz | Hammel 9304, DUKE, LSCR, MO. | Sin. Gonolobus denticulatus (Vahl) W. D. Stevens, Sin. Matelea viridiflora (Satndl.) Woodson | Nativa | 11 |
| Matelea reflexa | (Hemsl.) Morillo | Grayum 2691, DUKE. | Nativa | - | |
| Maxillaria brachybulbon | Schltr. | Folsom 9281 | Hist. Tax. Maxillaria xylobiiflora | Nativa | 20 |
| Maxillaria confusa | Ames & C. Schweinf. | B. Hammel 9060 | Nativa | 16 | |
| Maxillaria endresii | Rchb. f. | Aguilar 8355 | Nativa | 38 | |
| Maxillaria lueri | Dodson | Atwood 85-131 | Nativa | 3 | |
| Maxillariella sanguinea | (Rolfe) M. A. Blanco & Carnevali | E. Castro 53 | Sin. Maxillaria sanguinea Rolfe | Nativa | 34 |
| Maxillariella tenuifolia | (Lindl.) M. A. Blanco & Carnevali | M. Grayum 2474 | Sin. Maxillaria tenuifolia Lindl. | Nativa | 5 |
| Mazus pumilus | (Burm. f.) Steenis | G. Vargas 1199 | Sin. Mazus japonicus (Thunb) Kuntze | Exótica | 5 |
| Mecardonia procumbens | (Mill.) Small | O. Vargas 744 | Sin. Bacopa procumbens (Mill.) Greenm | Nativa | 9 |
| Megalastrum costipubens | R. C. Moran & J. Prado | M. Grayum 2887 | Hist. Tax. Ctenitis subincisa, Hist. Tax. Megalastrum subincisum | Nativa | 4 |
| Megalastrum galeottii | (M. Martens) R. C. Moran & J. Prado | M. Grayum 1055 | Hist. Tax. Ctenitis subincisa, Hist. Tax. Megalastrum subincisum | Nativa | - |
| Megaskepasma erythrochlamys | Lindau | O. Vargas 1710, LSCR. | Exótica | 10 | |
| Megathyrsus maximus | (Jacq.) B. K. Simon & S. W. L. Jacobs | Hammel 8726 | Sin. Panicum maximum Jacq. var. maximum; Urochloa maxima (Jacq.) R. D. Webster var. maxima | Exótica | 13 |
| Melampodium costaricense | Stuessy | O. Vargas 613, LSCR. | Nativa | 5 | |
| Melampodium divaricatum | (Rich.) DC. | R. Wilbur 37906, DUKE. | Nativa | 5 | |
| Melanthera nivea | (L.) Small | Hammel 8476, DUKE, LSCR, MO. | Sin. Melanthera aspera (Jacq.) Small | Nativa | 7 |
| Melinis minutiflora | P. Beauv. | Hammel 11639 | Exótica | 8 | |
| Meliosma donnellsmithii | Urb. | Hammel 9108 | Nativa | 14 | |
| Meliosma occidentalis | Cuatr. | Hammel 9724 | Hist. Tax. Meliosma vernicosa (Liebm.) Griseb. | Nativa | 12 |
| Melochia melissifolia | Benth. | McDowell 711 | Hist. Tax. Melochia nodiflora | Nativa | 4 |
| Melothria dulcis | Wunderlin | Hammel 8346, DUKE, LSCR, MO. | Nativa | 11 | |
| Melothria pendula | L. | M. Grayum 2734, DUKE. | Sin. Melothria scabra Naudin | Nativa | 22 |
| Mendoncia costaricana | Oerst. | B.Hammel 13093, DUKE. | Nativa | - | |
| Mendoncia retusa | Turrill | Aguilar 8143, LSCR. | Nativa | 21 | |
| Mendoncia tonduzii | Turrill | Aguilar 7624, LSCR. | Nativa | 16 | |
| Merinthopodium neuranthum | (Hemsl.) Donn. Sm. | Aguilar 7622 | Sin. Markea neurantha Hemsl. | Nativa | 22 |
| Merremia tuberosa | (L.) Rendle | O. Vargas 1151, LSCR. | Nativa | 19 | |
| Merremia umbellata | (L.) Hallier f. | Aguilar 8469, LSCR. | Nativa | 5 | |
| Mesechites trifidus | (Jacq.) Müll. Arg. | Aguilar 7812, LSCR. | Nativa | 15 | |
| Mesosphaerum suaveolens | (L.) Kuntze | R. Wilbur 38333, DUKE. | Sin. Hyptis suaveolens (L.) Poit. | Nativa de CR Plantada en LS | 2 |
| Metalepis peraffinis | (Woodson) Morillo | B. Hammel 9248 | Nativa | - | |
| Metaxya rostrata | (Kunth) C. Presl. | Hammel 11089 | Nativa | 2 | |
| Mickelia nicotianifolia | (Sw.) Alston | Hammel 8709 | Nativa | 8 | |
| Mickelia oligarchica | (Baker) Hennipman | M. Jones 454, M. Jones 458 | Nativa | 1 | |
| Miconia affinis | DC. | Aguilar 7768 | Sin. Miconia microcarpa DC. | Nativa | 14 |
| Miconia albertobrenesii | Gamba & Almeda | Hammel 9633 | Sin. Ossaea brenesii Standl. | Nativa | - |
| Miconia ampla | Triana | Hammel 10000 | Sin. Miconia involucrata Donn. Sm. | Nativa | - |
| Miconia appendiculata | Triana | Aguilar 7728 | Nativa | 21 | |
| Miconia approximata | Gamba & Almeda | Hammel 8750 | Sin. Clidemia densiflora (Standl.) Gleason | Nativa | 19 |
| Miconia argentea | (Sw.) DC. | E. Salicetti 425 (LSCR) | Nativa | - | |
| Miconia barbinervis | (Benth.) Triana | Hammel 9533 | Nativa | 22 | |
| Miconia bubalina | (D. Donn.) Naudin | Hammel 9553 | Hist. Tax. Miconia serrulata | Nativa | 18 |
| Miconia calocoma | Almeda | Hammel 9872 | Nativa | 13 | |
| Miconia calvescens | DC. | O. Vargas 1240 | Nativa | 10 | |
| Miconia centrodesma | Naudin | Aguilar 8106 | Nativa | 11 | |
| Miconia chrysophylla | (Rich.) Urb. | A. Gentry 78544 (MO) | Nativa | - | |
| Miconia commutata | Almeda | Hammel 7940 | Hist. Tax. Miconia smaragdina | Nativa | 3 |
| Miconia decurrens | Cogn. | R. Wilbur 37636 | Nativa | - | |
| Miconia dorsiloba | Gleason | B.Hammel 8077 | Nativa | 23 | |
| Miconia elata | (Sw.) DC. | Aguilar 7717 | Nativa | 8 | |
| Miconia gracilis | Triana | Aguilar 7716 | Nativa | 15 | |
| Miconia grayumii | Almeda | Aguilar 7729 | Hist. Tax. Miconia brenesii | Nativa | 12 |
| Miconia hyperprasina | Naudin | R. L. Wilbur 28251 | Nativa | - | |
| Miconia impetiolaris | (Sw.) D. Don ex DC. | Aguilar 7580 | Nativa | 9 | |
| Miconia lacera | (Bonpl.) Naudin | B. Hammel 12676 | Nativa | 17 | |
| Miconia lateriflora | Cogn. | B.Hammel & G.Schatz. 11583 | Nativa | 5 | |
| Miconia laxivenula | (Wurdack) Gamba & Almeda | Grayum 2979 | Sin. Ossaea laxivenula Wurdack | Nativa | 12 |
| Miconia ligulata | Almeda | Aguilar 7730 | Sin. Leandra consimilis Gleason | Nativa | 22 |
| Miconia longifolia | (Aubl.) DC. | Aguilar 8044 | Nativa | 44 | |
| Miconia multispicata | Naudin | Aguilar 7710 | Nativa | 17 | |
| Miconia neomicrantha | Judd & Skean | Aguilar 7732 | Sin. Ossaea micrantha (Sw.) Macfad. ex Cogn. | Nativa | 14 |
| Miconia nervosa | (Sm.) Triana | Aguilar 7574 | Nativa | 12 | |
| Miconia nutans | Donn. Sm. | B. Hammel 12368 (Duke) | Nativa | - | |
| Miconia prasina | (Sw.) DC. | B. Hammel 11484 | Nativa | 11 | |
| Miconia pterocaulon | Triana | E. Salicetti 327 (LSCR) | Nativa | 8 | |
| Miconia punctata | (Desr.) D. Don ex DC. | Aguilar 7706 | Nativa | 12 | |
| Miconia quinquenervia | (Mill.) Gamba & Almeda | P. A. Opler 826; C. E. Schnell 1015. | Sin. Ossaea quinquenervia (Mill.) Cogn., Sin. Clidemia quinquenervia (Mill.) Almeda | Nativa | - |
| Miconia reitziana | Cogn. & Gleason | Aguilar 7731 | Sin. Clidemia reitziana Cogn. & Gleason | Nativa | 8 |
| Miconia simplex | Triana | Aguilar 7605 | Nativa | 15 | |
| Miconia solearis | (Naudin) Gamba & Almeda | Hammel 8619 | Sin. Ossaea macrophylla (Benth.) Cogniaux, Sin. Miconia magnifolia Gamba & Almeda | Nativa | 10 |
| Miconia sparrei | Wurdack | Hammel 11485 | Hist. Tax. Miconia ?calvescens | Nativa | 12 |
| Miconia splendens | (Sw.) Griseb. | Hartshorn 1228 | Nativa | - | |
| Miconia stevensiana | Almeda | Hammel 9777 | Nativa | 13 | |
| Miconia trinervia | (Sw.) D. Don ex Loudon | Hammel 9548 | Nativa | 9 | |
| Miconia variabilis | Gamba & Almeda | O. Vargas 1293 | Sin. Ossaea robusta (Triana) Cogniaux | Nativa | 6 |
| Microchilus tridax | (Rchb. f.) Ormerod | O. Vargas 1307 | Sin. Erythrodes purpurea (Ames) Ames, Sin. Physurus tridax Rchb. F. , Sin. Erythrodes tridax (Rchb. F.) Ames | Nativa | 14 |
| Microgramma lycopodioides | (L.) Copel. | Hammel 10639 | Sin. Polypodium lycopodioides L. | Nativa | 3 |
| Microgramma percussa | (Cav.) Hook. & Grev. | Hammel 10672 | Sin. Polypodium percussum Cav. | Nativa | 2 |
| Microgramma reptans | (Cav.) A. R. Sm. | Aguilar 7957 | Sin. Polypodium ciliatum Willd. | Nativa | 14 |
| Microtea debilis | Sw. | O. Vargas 743 | Nativa | 5 | |
| Mikania cordifolia | (L. f.) Willd. | N. Zamora 3968, LSCR, INB. | Nativa | 13 | |
| Mikania guaco | Bonpl. | Hammel 9849, DUKE, LSCR. | Nativa | 10 | |
| Mikania hookeriana | DC. | Hartshorn 1826, LSCR, MO. | Hist. Tax. Mikania pittieri | Nativa | - |
| Mikania micrantha | Kunth | Aguilar 8328, LSCR. | Nativa | 18 | |
| Mikania simpsonii | W.C. Holmes & McDaniel | Hammel 8895, LSCR, MO. | Nativa | - | |
| Mikania sp. A | ? | B. Hammel 8470 | Hist. Tax Mikania gonzalezii | Nativa | - |
| Mikania tonduzii | B. L. Rob. | Hammel 8092, LSCR, MO. | Nativa | - | |
| Mikania vitifolia | DC. | R. Wilbur 38709, DUKE. | Nativa | 12 | |
| Mimosa debilis | Humb. & Bonpl. ex Willd. | J. González 9052, LSCR. | Nativa | 5 | |
| Mimosa myriadenia | (Benth.) Benth. | Hammel 11061, DUKE. | Nativa | 15 | |
| Mimosa pudica | L. | Aguilar 8254, LSCR. | Nativa | 29 | |
| Mimosa tarda | Barneby | Hammel 8451, DUKE, MO. | Hist. Tax. Mimosa pigra | Nativa | 29 |
| Mimosa watsonii | B. L. Rob. | B.Hammel 11651, DUKE. | Nativa | 24 | |
| Minquartia guianensis | Aubl. | B.Hammel 10642 | Nativa | 12 | |
| Mirabilis jalapa | L. | J. González 7616 | Exótica | 8 | |
| Mitracarpus hirtus | (L.) DC. | R. Wilbur 70158 | Sin. Mitracarpus villosus (Sw.) DC. | Nativa | 2 |
| Mollinedia costaricensis | Donn. Sm. | Aguilar 7781 | Nativa | 11 | |
| Mollugo verticillata | L. | B. Hammel 11868 | Nativa | 10 | |
| Momordica charantia | L. | R. Wilbur 34864, DUKE. | Exótica | 15 | |
| Monstera adansonii | Schott | Aguilar 7811 | Nativa | 13 | |
| Monstera costaricensis | (Engl. & K. Krause) Croat & Grayum | M. Grayum 2299 | Nativa | 15 | |
| Monstera dissecta | (Schott) N. E. Br. ex Donn. Sm. | M. Grayum 2179 | Nativa | 9 | |
| Monstera glaucescens | Croat & Grayum | M. Grayum 8972 | Nativa | 12 | |
| Monstera molinae | Grayum | M. Grayum 2547 | Hist. Tax. Monstera spruceana | Nativa | 4 |
| Monstera pittieri | Engl. | Hammel 9509 | Nativa | 5 | |
| Monstera spruceana | (Schott) Engl. | M. Grayum 5356 | Hist. Tax. Monstera skutchii | Nativa | 3 |
| Monstera standleyana | G. S. Bunting | M. Grayum 3058 | Nativa | - | |
| Monstera tenuis | K. Koch | Jacobs 2770 | Nativa | 36 | |
| Monstera tuberculata | Lundell | Aguilar 7829 | Nativa | 26 | |
| Morinda citrifolia | Hunter | O. Vargas 1404 | Exótica | 15 | |
| Mormodes horichii | Fowlie | O. Vargas 2010 | Nativa | 14 | |
| Mormolyca hedwigiae | (Hamer & Dodson) M. A. Blanco | B. Hammel 8035 | Sin. Maxillaria hedwigiae Hamer & Dodson | Nativa | 4 |
| Mormolyca moralesii | Carnevali & Dodson | Folsom 9102 | Sin. Maxillaria acutifolia Lindl., Sin. Maxillaria moralesii Carnevali & J. T. Atwood | Nativa | 4 |
| Mortoniodendron costaricense | Standl. & L.O. Williams | O. Vargas 548 | Hist. Tax. Mortoniodendron anisophyllum, Mortoniodendron guatemalense | Nativa | 12 |
| Mouriri gleasoniana | Standl. ex Standl. & Steyerm. | B.Hammel 9317 | Nativa | 19 | |
| Moutabea gentryi | T. Wendt | Aguilar 8194 | Hist. Tax. Moutabea aculeata, Hist. Tax. Moutabea longifolia | Nativa | 29 |
| Mucuna holtonii | (Kuntze) Moldenke | Aguilar 7587, LSCR. | Sin. Mucuna andreana Micheli | Nativa | 24 |
| Murdannia nudiflora | (L.) Brenan | J. González 6813, LSCR. | Exótica | 8 | |
| Musa X paradisiaca | L. | O. Vargas 1668 | Exótica | 9 | |
| Musa acuminata | Colla | O. Vargas 1663 | Exótica | 17 | |
| Musa velutina | H. Wendl. & Drude | Aguilar 8258 | Exótica | 10 | |
| Myoxanthus sotoanum | Pupulin, Bogarín & M. Fernández | Richardson 111 | Hist. Tax. Myoxanthus scandens | Nativa | 21 |
| Myrcia aliena | McVaugh | Gentry 78581 | Nativa | 11 | |
| Myrcia splendens | (Sw.) DC. | M.Grayum 2954 | Sin. Myrcia costaricensis O. Berg | Nativa | 14 |
| Myrciaria vexator | McVaugh | A. Hurtado 008 (LSCR) | Nativa | 9 | |
| Myriocarpa longipes | Liebm. | Hammel 8474 | Sin. Myriocarpa yzabalensis (Donn. Sm.) Killip | Nativa | 10 |
| Myristica fragrans | Houtt. | O. Vargas 1658 | Nativa | 7 | |
| Napeanthus apodemus | Donn. Sm. | B.Hammel 10995, MO. | Sin. Napeanthus bicolor (L.O. Williams) Barringer, Hist. Tax. Napeanthus apodemus | Nativa | - |
| Napeanthus bracteatus | C. V. Morton | B.Hammel 8626, DUKE. | Sin. Napeanthus bicolor (L.O. Williams) Barringer, Hist. Tax. Napeanthus apodemus | Nativa | 10 |
| Naucleopsis naga | Pittier | Aguilar 7616 | Sin. Ogcodeia naga (Pittier) Mildbr. | Nativa | 29 |
| Nectandra cissiflora | Nees | Hammel 11168, DUKE, LSCR, MO. | Sin. Nectandra paulii C. K. Allen | Nativa | - |
| Nectandra hypoleuca | Hammel | Hammel 9111, LSCR, MO. | Nativa | 7 | |
| Nectandra membranacea | (Sw.) Griseb. | Aguilar 8075, LSCR. | Sin. Nectandra standleyi C. K. Allen | Nativa | 34 |
| Nectandra purpurea | (Ruiz & Pav. ) Mez | Jacobs 2540, DUKE, MO. | Sin. Nectandra latifolia (Kunth) Mez | Nativa | 5 |
| Nectandra reticulata | (Ruiz & Pav.) Mez | B.Hammel 10479, DUKE, LSCR, MO. | Sin. Nectandra mollis (Kunth) Nees | Nativa | 19 |
| Neea amplifolia | Donn. Sm. | Aguilar 7782 | Nativa | 22 | |
| Neea delicatula | Standl. | Hammel 8704 | Nativa | 1 | |
| Neea elegans | P. H. Allen | Jacobs 2518 | Nativa | 8 | |
| Neea laetevirens | Standl. | Aguilar 7592 | Hist Tax. Neea psychotriodes | Nativa | 17 |
| Neea popenoei | P.H. Allen | O. Vargas 1957 | Nativa | 14 | |
| Neea urophylla | Standl. | O. Vargas 1591 | Nativa | 6 | |
| Neomarica caerulea | (Ker Gawl.) Sprague | J. González 7998, LSCR. | Exótica | 12 | |
| Neomarica longifolia | (Link & Otto) Sprague | J. González 7619, LSCR. | Exótica | 5 | |
| Nephelium ramboutan-ake | (Labill.) Lenhouts | K. Bawa 529 | Sin. Nephelium mutabile Blume | Exótica | 4 |
| Nephrolepis biserrata | (Sw.) Schott | M. Grayum 1318 | Nativa | 9 | |
| Nephrolepis brownii | (Desv.) Hovenkamp & Miyam | M. Grayum 3006 | Sin. Nephrolepis multiflora (Roxb.) F. M. Jarrett ex C. V. Morton, Hist. Tax. N. hirsutula | Exótica | 1 |
| Nephrolepis pendula | (Raddi) J. Sm. | M. Grayum 1020 | Hist. Tax. N. obtusiloba | Nativa | - |
| Nephrolepis rivularis | (Vahl) Mett. ex Krug | Hammel 10713 | Nativa | 4 | |
| Nepsera aquatica | (Aubl.) Naudin | Hammel 10755 | Nativa | 10 | |
| Neurolaena lobata | (L.) R. Br. | Grayum 2675, DUKE, LSCR. | Nativa | 5 | |
| Nidema boothii | (Lindl.) Schltr. | E. Castro18 | Sin. Epidendrum boothii (Lindl.) L. O. Williams | Nativa | 7 |
| Niphidium crassifolium | (L.) Lellinger | M. Grayum 1919 | Sin. Niphidium oblanceolatum A. Rojas | Nativa | - |
| Notopleura anomothyrsa | (K. Schum. & Donn. Sm.) C. M. Taylor | Hammel 9000 | Hist. Tax. Psychotria macrophylla | Nativa | 15 |
| Notopleura camponutans | (Dwyer & M. V. Hayden) C. M. Taylor | M. Grayum 3590 | Sin. Cephaelis camponutans Dwyer & M. V. Hayden, Sin. Psychotria camponutans (Dwyer & M. V. Hayden) Hammel | Nativa | - |
| Notopleura capacifolia | (Dwyer) C. M. Taylor | Hammel 10830 | Sin. Psychotria capacifolia Dwyer | Nativa | 8 |
| Notopleura capitata | C. M. Taylor | Aguilar 7633 | Hist. Tax. Psychotria tonduzii, Hist. Tax. Psychotria aggregata | Nativa | 15 |
| Notopleura epiphytica | (K. Krause) C.M. Taylor | B. Hammel 9526 | Sin. Psychotria orchidearum Standl. | Nativa | 6 |
| Notopleura polyphlebia | (Donn. Sm.) C. M. Taylor | Hammel 8705 | Sin. Psychotria polyphlebia Donn. Sm. | Nativa | 6 |
| Notopleura siggersiana | (Standl.) C. M. Taylor | Hammel 10459 | Sin. Psychotria siggersiana Standl., Hist. Tax. Psychotria aggregata | Nativa | 6 |
| Notopleura uliginosa | (Sw.) Bremek. | Hammel & Trainer 13229 | Sin. Psychotria uliginosa Sw. | Nativa | 8 |
| Nymphaea conardii | Wiersema | R. Wilbur 64643 | Hist. Tax. N. ampla, N. glandulifera | Nativa | 15 |
| Ochroma pyramidale | (Cav. ex Lam.) Urb. | Hammel 10669 | Sin. Ochroma lagopus (Cav. ex Lam.) Urb. | Nativa | 43 |
| Ocimum campechianum | Mill. | R. Wilbur 63232, DUKE. | Nativa de CR Plantada en LS | 10 | |
| Ocotea atirrensis | Mez & Donn. Sm. ex Mez | Hammel 8131, DUKE, LSCR. | Nativa | 11 | |
| Ocotea cernua | (Nees) Mez | Aguilar 7667, LSCR. | Sin. Nectandra caudata (Nees) Mez, Sin. Nectandra killipii A.C.Sm. | Nativa | 13 |
| Ocotea dendrodaphne | Mez | Aguilar 7936, LSCR. | Nativa | 20 | |
| Ocotea floribunda | (Sw.) Mez | Hammel 9705, DUKE, LSCR, MO. | Sin. Ocotea wachenheimii Benoist | Nativa | 5 |
| Ocotea glaucosericea | Rohwer | Hammel 12450, DUKE, LSCR, MO. | Hist. Tax. Ocotea caracasana (Nees) Mez vel sp. aff. | Nativa | - |
| Ocotea hartshorniana | Hammel | Aguilar 7661, LSCR. | Nativa | 19 | |
| Ocotea insularis | (Meisn.) Mez | B. Hammel 10538, DUKE, LSCR, MO. | Sin. Ocotea ira Mez & Pittier ex Mez | Nativa | 6 |
| Ocotea leucoxylon | (Sw.) Laness. | M. Grayum 2388, DUKE, MO. | Sin. Ocotea lenticellata Lundell | Nativa | 8 |
| Ocotea macropoda | (Kunth) Mez | Hammel & Trainer 10871, DUKE, LSCR. | Sin. Ocotea babosa C. K. Allen | Nativa | 4 |
| Ocotea meziana | R.L. Brooks | J. González 7768, LSCR. | Hist. Tax. Ocotea laetevirens | Nativa | 10 |
| Ocotea mollifolia | Mez & Pittier ex Mez | Hammel 10684, DUKE, LSCR. | Nativa | 7 | |
| Ocotea pentagona | Mez | J. González 7548, LSCR. | Hist. Tax. Ocotea nicaraguensis | Nativa | 4 |
| Ocotea sp. 1 | ? | Hammel 10229, DUKE, LSCR. | Hist. Tax. O. bijuga -vel sp. aff., Hist. Tax. Ocotea sp. A | Nativa | - |
| Ocotea tenera | Mez & Donn. Sm. ex Mez | Hammel 10499, DUKE. | Nativa | 12 | |
| Ocotea valerioides | W.C. Burger | Aguilar 8512, LSCR. | Nativa | 14 | |
| Octomeria costaricensis | Schltr. | O. Vargas 1399 | Hist. Tax. Octomeria sp. Atwood en Selbyana 10: 99 (1988) | Nativa | 14 |
| Octomeria graminifolia | (L.) R. Br. | M. Grayum 2807 | Nativa | 4 | |
| Odontadenia macrantha | (Roem. & Schult.) Markgr. | B. Hammel 12796, DUKE, MO. | Nativa | 28 | |
| Odontadenia puncticulosa | (L. Richt.) Pulle | B. Hammel 11683, DUKE. | Nativa | 8 | |
| Odontadenia verrucosa | (Willd. ex Roem. & Schult.) K. Schum. ex Markgr. | Hammel 8601, DUKE. | Sin. Odontadenia cognata (Stadelm.) Woodson | Nativa | - |
| Odontocarya truncata | Standl. | Hammel 10942 | Nativa | 6 | |
| Odontonema cuspidatum | (Nees) Kuntze | I. Chacón 995, MO. | Exótica | 12 | |
| Odontonema tubaeforme | (Bertol.) Kuntze | Aguilar 7695, LSCR. | Nativa | 21 | |
| Oeceoclades maculata | (Lindl.) Lindl. | O. Vargas 1303 | Exótica | 15 | |
| Oldenlandia corymbosa | L. | O. Vargas 1350 | Sin. Hedyotis corymbosa (L.) Lam. | Nativa | 9 |
| Oldenlandia lancifolia | (Schumach.) DC. | M. Grayum 2651 | Sin. Hedyotis lancifolia Schumach | Nativa | 5 |
| Oleandra articulata | (Sw.) C. Presl | Hammel 11140 | Nativa | 12 | |
| Olfersia cervina | (L.) Kunze | Hammel 10687 | Sin. Polybotrya cervina (L.) Kaulf. | Nativa | 4 |
| Olyra latifolia | L. | Hammel 8405 | Nativa | 2 | |
| Omphalea diandra | L. | O. Vargas 1370, LSCR. | Nativa | 14 | |
| Oncidium stenotis | Rchb. f. | E. Castro 30 | Nativa | 23 | |
| Ophioglossum nudicaule | L. f. | O. Vargas 2054 | Nativa | 10 | |
| Ophioglossum reticulatum | L. | R. Wilbur 40691 | Nativa | 6 | |
| Oplismenus burmannii | (Retz.) P. Beauv. | Judziewicz 4323 | Nativa | 8 | |
| Oplismenus hirtellus | (L.) P. Beauv. | R. Wilbur 63381, 65066 | Nativa | - | |
| Oreopanax capitatus | (Jacq.) Decne. & Planch. | O. Vargas 706, LSCR. | Nativa | 16 | |
| Ormosia amazonica | Ducke | N. Zamora 4044, LSCR. | Nativa | 14 | |
| Ormosia intermedia | N.Zamora | O. Vargas 576, LSCR. | Nativa | 11 | |
| Ormosia subsimplex | Spruce ex Benth. | E. Salicetti 395, LSCR | Nativa | - | |
| Ormosia velutina | Rudd | Aguilar 7930, LSCR. | Nativa | 25 | |
| Ornithidium fulgens | Rchb. f. | E. Castro 0024 | Sin. Maxillaria fulgens (Rchb. f.) L. O. Williams | Nativa | 13 |
| Ornithidium nicaraguense | (Hamer & Garay) M. A. Blanco & Ojeda | C. Todzia 1114 | Sin. Maxillaria nicaraguensis (Hamer & Garay) J. T. Atwood; Sin. Neo-urbania nicaraguensis Hamer & Garay | Nativa | 3 |
| Ornithocephalus bicornis | Lindl. ex Benth. | E. Castro 52 | Nativa | 7 | |
| Orthoclada laxa | (Rich.) P. Beauv. | Hammel 8153 | Nativa | 9 | |
| Oryctanthus alveolatus | (Kunth) Kuijt | B. Hammel 8681, DUKE. | Nativa | - | |
| Oryctanthus callicarpus | Kuijt | B.Hammel 9326, DUKE. | Hist. Tax. Oryctanthus occidentalis (L.) Eichler | Nativa | 7 |
| Oryctanthus cordifolius | (C. Presl) Urb. | Hammel 10614 | Nativa | - | |
| Oryza latifolia | Desv. | Grayum 2692 | Nativa | 6 | |
| Otoba novogranatensis | Moldenke | Hammel 13170 | Sin. Dialyanthera otoba (Humb. & Bonpl.) Warb. | Nativa | 6 |
| Ouratea crassinervia | Engl. | Aguilar 8103 | Sin. O. costaricensis Standl., Hist. Tax. Ouratea curvata | Nativa | 11 |
| Ouratea prominens | Dwyer | Hammel 10977 | Hist. Tax. Ouratea lucens | Nativa | 11 |
| Ouratea valerioi | Standl. | Hammel 8819 | Nativa | 9 | |
| Oxalis barrelieri | L. | E. Castro 0025 | Nativa | 14 | |
| Oxalis corniculata | L. | R. Wilbur 38063 | Hist. Tax. O. filiformis | Nativa | - |
| Oxalis frutescens | L. | R. Wilbur 39062 | Nativa | - | |
| Pachira aquatica | Aubl. | Folsom 9479 | Nativa | 38 | |
| Pachyrhizus ferrugineus | (Piper) M. Sorensen | Hammel 10390, DUKE, LSCR. | Nativa | 6 | |
| Pachystachys lutea | Nees | J. González 7712, LSCR. | Exótica | 4 | |
| Palicourea beachiana | C.M. Taylor | B. Hammel 10383 | Sin. Coussarea nigrescens C.M. Taylor & Hammel | Nativa | 12 |
| Palicourea calidicola | (C.M. Taylor) C.M. Taylor | Aguilar 7598 | Sin. Psychotria calidicola C.M. Taylor, Hist. Tax. Psychotria eurycarpa | Nativa | 26 |
| Palicourea crocea | (Sw.) Roem. & Schult. | Hammel 8158 | Nativa | 11 | |
| Palicourea guianensis | Aubl. | Solano 1275 | Nativa | 34 | |
| Palicourea hondensis | (Standl.) C.M. Taylor | T. McDowell 1001 | Sin. Coussarea hondensis (Standl.) C.M. Taylor & W.C. Burger, Sin. Psychotria ostaurea Dwyer & M. V. Hayden, Hist. Tax. C. taurina | Nativa | 17 |
| Palicourea psychotrioides | (C.M. Taylor & Hammel) C.M. Taylor | Aguilar 7937 | Sin. Coussarea psychotrioides C.M. Taylor & Hammel | Nativa | 18 |
| Palicourea tetragona | (Donn. Sm.) C.M. Taylor & Lorence | Aguilar 7863 | Sin. Psychotria chiapensis Standl. | Nativa | 32 |
| Palmorchis powellii | (Ames) C. Schweinf. & Correll | O. Vargas 1315 | Nativa | 12 | |
| Palmorchis sordida | Dressler | M. Grayum 2871 | Nativa | 6 | |
| Palmorchis trilobulata | L. O. Williams | Aguilar 7818 | Nativa | 9 | |
| Panicum grande | Hitchc. & Chase | Hammel 11153 | Nativa | - | |
| Panicum hirsutum | Sw. | B. Hammel 11795 | Nativa | - | |
| Panicum laxum | Sw. | Hammel 8238 | Sin. Steinchisma laxa (Sw.) Zuloaga, Hist. Tax. Panicum boliviense Hack. | Nativa | 9 |
| Panicum pilosum | Sw. | Hammel 11781 | Nativa | 5 | |
| Panicum polygonatum | Schrad. | Hammel 8860 | Sin. Panicum boliviense Hack. | Nativa | 12 |
| Panicum pulchellum | Raddi | R. Wilbur 66705 | Sin. Ocellochloa pulchella (Raddi) Zuloaga & Morrone | Nativa | - |
| Panicum stagnatile | Hitchc. & Chase | Hammel 10296 | Nativa | - | |
| Panicum stoloniferum | Poir. | Hammel 9206 | Sin. Ocellochloa stolonifera (Poir.) Zuloaga & Morrone, Sin. Panicum frondescens G. Mey. | Nativa | 7 |
| Panicum trichanthum | Nees | B. Hammel 11794 | Nativa | 3 | |
| Panicum trichoides | Sw. | Hammel 8311 | Nativa | 10 | |
| Paradrymonia ciliosa | (Mart.) Wiehler | Aguilar 7708, LSCR. | Sin. Paradrymonia decurrens (C. V. Morton) Wiehler | Nativa | 15 |
| Parapolystichum excultum | (Mett.) Labiak, Sundue & R.C. Moran | Hammel 8793 | Sin. Lastreopsis chontalensis (E. Fourn.) Lellinger, Lastreopsis exculta (Mett.) Tindale, Hist. Tax. Lamariopsis exculta (Mett.) Tindale | Nativa | 3 |
| Parathesis microcalyx | Donn. Sm. | Hammel 10804 | Nativa | 1 | |
| Parathesis trichogyne | Hemsl. | Hammel 10939 | Sin. Parathesis chrysophylla Lundell, Sin. Parathesis longipetiolata Lundell, Sin. Parathesis pallida Lundell | Nativa | 6 |
| Pariana parvispica | R. W. Pohl | Aguilar 7743 | Hist Tax. Parianella parvispica R. W. Pohl | Nativa | 5 |
| Paspalum conjugatum | P.J. Bergius | McDowell 957 | Nativa | 6 | |
| Paspalum decumbens | Sw. | Hammel 8333 | Nativa | 9 | |
| Paspalum fasciculatum | Willd. ex Flüggé | Hammel 9717 | Nativa | 10 | |
| Paspalum orbiculatum | Poir. | B. Hammel 9388 | Nativa | - | |
| Paspalum paniculatum | L. | M. Grayum 2118 | Nativa | 9 | |
| Paspalum plicatulum | Michx. | R. Wilbur 70039 | Nativa | 11 | |
| Paspalum virgatum | L. | R. Wilbur 40276 | Nativa | 2 | |
| Passiflora ambigua | Hemsl. | Aguilar 7833 | Nativa | 51 | |
| Passiflora arbelaezii | L. Uribe | Hammel 10248 | Nativa | 26 | |
| Passiflora auriculata | Kunth | Aguilar 7593 | Nativa | 5 | |
| Passiflora biflora | Lam. | Aguilar 8304 | Nativa | 26 | |
| Passiflora costaricensis | Killip | B. Hammel 11697 | Nativa | - | |
| Passiflora edulis | Sims | I. Chacón 1102 | Exótica | 13 | |
| Passiflora foetida | L. | Hammel 9107 | Nativa | 16 | |
| Passiflora lancearia | Mast. | Hammel 10918 | Nativa | 13 | |
| Passiflora lobata | (Killip) Hutch. ex J. M. MacDougal | O. Vargas 1503 | Sin. Tetrastylis lobata Killip. | Nativa | 47 |
| Passiflora megacoriacea | Porter-Utley -sp. nov. ined. | Hammel 9189 | Hist. Tax. P. coriacea | Nativa | 12 |
| Passiflora menispermifolia | Kunth | Aguilar 8267 | Nativa | 33 | |
| Passiflora nitida | Kunth | B. Hammel 11602 | Nativa | 15 | |
| Passiflora oerstedii | Mast. | Hammel 8407 | Nativa | 9 | |
| Passiflora pittieri | Mast. | Aguilar 7764 | Nativa | 35 | |
| Passiflora quadrangularis | L. | Hammel 10957 | Exótica | 6 | |
| Passiflora vitifolia | Kunth | Aguilar 7590 | Nativa | 22 | |
| Passovia pyrifolia | (Kunth) Tiegh. | Grayum 2769, DUKE. | Phthirusa pyrifolia (Kunth) Eichler | Nativa | 7 |
| Paullinia bracteosa | Radlk. | Hammel & Trainer 12891, 12878 | Nativa | 13 | |
| Paullinia clavigera | Schltdl. | Hammel 7774 | Hist. Tax. Paullinia pinnata | Nativa | - |
| Paullinia fasciculata | Radlk. | Aguilar 7601 | Nativa | 10 | |
| Paullinia fibrigera | Radlk. | Hammel & Trainer 13252 | Nativa | 6 | |
| Paullinia fuscescens | Kunth | B. Hammel 12995 | Nativa | - | |
| Paullinia granatensis | (Planch. & Linden) Radlk | Aguilar 7908 | Sin. Paullinia paullinioides Radlk. | Nativa | 21 |
| Paullinia ingifolia | Rich. ex Juss | Hammel 10676 | Sin. Paullinia grandifolia, Hist.Tax. P. pseudostipitata | Nativa | 8 |
| Paullinia pterocarpa | Triana & Planch. | D. Solano 1276 | Nativa | 27 | |
| Paullinia rugosa | Benth. ex Radlk. | Hammel 10932 | Nativa | 15 | |
| Paullinia serjaniifolia | Triana & Planch. | Hammel 10935 | Nativa | 8 | |
| Paullinia sp. A | ? | Aguilar 7858 | Hist. Tax. Paullinia baileyi aff. | Nativa | 41 |
| Pavonia castaneifolia | A. St.-Hil. & Naudin | M. Grayum 10006 | Sin. Pavonia longipes Standl. | Nativa | 5 |
| Pavonia corymbosa | (Sw.) Willd. | J. Mowbray 1361 | Nativa | - | |
| Pavonia schiedeana | Steud. | Aguilar 8119 | Sin. Pavonia rosea Schltdl. | Nativa | 18 |
| Pecluma dulcis | (Poir.) -comb. ined. | Hammel 10701 | Sin. Polypodium sororium Humb. & Bonpl. ex Willd., Sin. Polypodium dulce Poir. | Nativa | 4 |
| Pecluma hygrometrica | (Splitg.) M. G. Price | M. Grayum 2404 | Sin. Polypodium hygrometricum Splitg. | Nativa | 5 |
| Pecluma pectinata | (L.) M. G. Price | M. Grayum 1863 | Sin. Polypodium pectinatum L. | Nativa | 2 |
| Pentaclethra macroloba | (Willd.) Kuntze | Aguilar 7850, LSCR. | Nativa | 84 | |
| Pentagonia monocaulis | C. M. Taylor | Aguilar 7755 | Hist. Tax. Pentagonia donnell-smithii | Nativa | 25 |
| Peperomia calvicaulis | C. DC. | N. Zamora 4008 | Hist. Tax. Peperomia distachya | Nativa | 3 |
| Peperomia distachyos | (L.) A. Dietr. | J. Mowbray 1317 | Nativa | - | |
| Peperomia ebingeri | Yunck. | M. Grayum 9641 | Nativa | - | |
| Peperomia emarginella | (Sw.) C. DC. | B. Hammel 12406 | Nativa | 4 | |
| Peperomia filicaulis | C. DC. | R. Wilbur 65165 | Nativa | - | |
| Peperomia glabella | (Sw.) A. Dietr. | Hammel 8174 | Nativa | 5 | |
| Peperomia hernandiifolia | (Vahl) A. Dietr. | Aguilar 8249 | Hist. Tax. P. flexinervia | Nativa | 6 |
| Peperomia montecristana | Trel. | Hammel 12455 | Nativa | - | |
| Peperomia obtusifolia | (L.) A. Dietr. | Hammel 10548 | Nativa | 8 | |
| Peperomia oerstedii | C. DC. | Aguilar 7830 | Nativa | 4 | |
| Peperomia pellucida | (L.) Kunth | J. González 6822 | Nativa | 5 | |
| Peperomia pernambucensis | Miq. | Hammel 8423 | Nativa | 2 | |
| Peperomia portobellensis | Beurl. | N. Zamora 3922 | Hist. Tax. P. macrostachyos | Nativa | 4 |
| Peperomia pseudocasaretti | C. DC. | Hammel 12763 | Sin. Peperomia serpens (Sw.) Loudon, Hist. Tax. Peperomia pseudocasarettoi | Nativa | - |
| Peperomia pseudopereskiifolia | C. DC. | M. Grayum 1024 | Sin. Peperomia seemanniana Miq. | Nativa | 3 |
| Peperomia rotundifolia | (L.) Kunth | Aguilar 7835 | Nativa | 6 | |
| Peperomia silvivaga | C. DC. | Hammel 10612 | Sin. Peperomia panamensis C. DC. | Nativa | 2 |
| Peperomia urocarpa | Fisch. & C.A. Mey. | O. Vargas 616 | Sin. P. cataratasensis Trel.; Hist. Tax. P. serpens | Nativa | 6 |
| Peperomia vinasiana | C. DC. | O. Vargas 1400 | Nativa | 12 | |
| Peperomia vueltasana | Trel. | P. Lesica 4152 | Hist. Tax. P. alata (al menos pro parte) y P. albispica | Nativa | 6 |
| Pera arborea | Mutis | Hammel 11581, DUKE, LSCR, MO. | Nativa | 4 | |
| Perebea hispidula | Standl. | Aguilar 7648 | Hist. Tax. Perebea angustifolia | Nativa | 29 |
| Peristethium leptostachyum | (Kunth) Tiegh. | Hammel 8384, DUKE, MO. | Sin. Struthanthus leptostachyus (Kunth) G. Don | Nativa | 10 |
| Peritassa laevigata | (Hoffmanns. ex Link) A. C. Sm. | Hammel 10961, DUKE, MO. | Nativa | 4 | |
| Persea americana | Mill | Solano 1144, LSCR. | Nativa de CR Plantada en LS | 19 | |
| Persea silvatica | Van der Werff | Hammel 9453, DUKE, LSCR, MO. | Hist. Tax. Persea rigens | Nativa | 4 |
| Petiveria alliacea | L. | Hammel 9355 | Nativa | 11 | |
| Petrea volubilis | L. | O. Vargas 1186 | Nativa | 19 | |
| Pharus latifolius | L. | Aguilar 7963 | Nativa | 25 | |
| Pharus virescens | Döll | Grayum 980 | Nativa | 6 | |
| Pharus vittatus | Lem. | Hammel 8272 | Sin. Pharus cornutus Hack | Nativa | 16 |
| Phenax sonneratii | (Poir.) Wedd. | M. Grayum 1258 | Nativa | 7 | |
| Philodendron alliodorum | Croat & Grayum | Aguilar 7938 | Hist. Tax. Philodendron pluricostatum | Nativa | 13 |
| Philodendron angustilobum | Croat & Grayum | M. Grayum 8302 | Nativa | - | |
| Philodendron aromaticum | Croat & Grayum | B. Hammel 10733 | Nativa | 5 | |
| Philodendron aurantiifolium | Schott | Grayum2906 | Nativa | 12 | |
| Philodendron bakeri | Croat & Grayum | B. Hammel 7805 | Hist. Tax. Philodendron inconcinnum | Nativa | 5 |
| Philodendron brevispathum | Schott | O. Vargas 1196 | Nativa | 13 | |
| Philodendron brunneicaule | Croat & Grayum | Hammel & Fraser 11102 | Nativa | 6 | |
| Philodendron cretosum | Croat & Grayum | M. Grayum 1894 | Nativa | 9 | |
| Philodendron davidsonii | Croat | M. Grayum 2931 | Nativa | 5 | |
| Philodendron ensifolium | Croat & Grayum | Grayum 2834 | Hist. Tax. Philodendron nitidum, Hist. Tax. Philodendron senatocarpium | Nativa | 4 |
| Philodendron fragrantissimum | (Hook.) G. Don | M. Grayum 2436 | Nativa | 6 | |
| Philodendron grandipes | K. Krause | Hammel 9126 | Nativa | 15 | |
| Philodendron hederaceum | (Jacq.) Schott | B.Hammel & Trainer 10795 | Sin. Philodendron scandens K. Koch & Sello | Nativa | 9 |
| Philodendron herbaceum | Croat & Grayum | Hammel 8218 | Hist. Tax. Philodendron radicans | Nativa | - |
| Philodendron inaequilaterum | Liebm. | Hammel 8922 | Nativa | 8 | |
| Philodendron jacquinii | Schott | B. Hammel 10500 | Hist. Tax. Philodendron hederaceum | Nativa | - |
| Philodendron jodavisianum | G. S. Bunting | M. Grayum 1915 | Hist. Tax. Philodendron mediacostatum | Nativa | 6 |
| Philodendron ligulatum | Schott | M. Grayum 2800 | Nativa | 7 | |
| Philodendron opacum | Croat & Grayum | M. Grayum 2756 | Hist. Tax. Philodendron mediavaginatum | Nativa | 7 |
| Philodendron platypetiolatum | Madison | T. McDowell 647 | Nativa | 4 | |
| Philodendron pterotum | K. Koch & Augustin | Hammel 8150 | Nativa | 9 | |
| Philodendron radiatum | Schott | Jacobs 2707 | Nativa | 13 | |
| Philodendron rhodoaxis | G. S. Bunting | Hammel 9521 | Hist. Tax. Philodendron lewisii | Nativa | 3 |
| Philodendron rigidifolium | K. Krause | B.Hammel 9511 | Nativa | 5 | |
| Philodendron rothschuhianum | (Engl.) Croat & Grayum | Aguilar 7801 | Nativa | 32 | |
| Philodendron sagittifolium | Liebm. | B. Hammel 10244 | Nativa | 5 | |
| Philodendron schottii | K. Koch | M.Grayum 2907 | Sin. Philodendron talamancae Engl. | Nativa | 4 |
| Philodendron sulcatum | K. Krause | M.Grayum 2814 | Hist. Tax. Philodendron karsteniamum, Hist. Tax. Philodendron viaticum | Nativa | 5 |
| Philodendron tenue | K. Koch & Augustin | M. Grayum 2626 | Nativa | 5 | |
| Philodendron tripartitum | (Jacq.) Schott | Aguilar 7803 | Nativa | 10 | |
| Philodendron wendlandii | Schott | McDowell 943 | Nativa | 14 | |
| Philodendron wilburii | Croat & Grayum | Valerio s.n. | Nativa | - | |
| Phlebodium pseudoaureum | (Cav.) Lellinger | McDougal 1040 | Sin. Phlebodium areolatum (Humb. & Bonpl. ex Willd.) J. Sm. | Nativa | 25 |
| Pholidostachys pulchra | H. Wendl. ex Hemsl. | O. Vargas 735, LSCR. | Nativa | 42 | |
| Phoradendron burgeri | Kuijt | B. Hammel 11568, 12643B | Hist. Tax. Phoradendron acinacifolium, P. quadrangulare (pro parte) | Nativa | - |
| Phoradendron chrysocladon | A. Gray | M. Grayum 1947 | Sin. Phoradendron flavens (Sw.) Griseb. | Nativa | - |
| Phoradendron dipterum | Eichler | B. Hammel 12643A, J. Folsom 9314A | Hist. Tax. P. quadrangulare (pro parte) | Nativa | - |
| Phoradendron herbert-smithii | Trel. | Folsom 9314B | Nativa | - | |
| Phoradendron piperoides | (Kunth) Trel. | Aguilar 7662 | Nativa | 9 | |
| Phyllanthus amarus | Schumach. & Thonn. | J. González 7767 | Nativa | 2 | |
| Phyllanthus caribaeus | Urb. | R. Wilbur 28085 | Nativa | - | |
| Phyllanthus caroliniensis | Walt. | J. González 7649 | Nativa | 3 | |
| Phyllanthus skutchii | Standl. | Aguilar 7948 | Nativa | 23 | |
| Phyllanthus stipulatus | (Raf.) G. L. Webster | J. González 6974 | Nativa | 4 | |
| Phyllanthus urinaria | L. | R. Wilbur 37177 | Nativa | 2 | |
| Physalis angulata | L. | B. Jacobs 2336 | Nativa | 10 | |
| Physalis pubescens | L. | Hammel 8897 | Nativa | 18 | |
| Phytolacca rivinoides | Kunth & C. D. Bouché | Hammel 8179 | Nativa | 6 | |
| Picramnia latifolia | Tul. | Folsom 10088 | Hist. Tax. Picramnia cooperi | Nativa | 5 |
| Pilea cadierei | Gagnep. | J. González 7648 | Nativa | 6 | |
| Pilea ecboliophylla | Donn. Sm. | Hammel 8100 | Sin. Pilea diversissima Killip | Nativa | 4 |
| Pilea glabra | S. Watson | M. Grayum 2000 | Hist. Tax. Pilea quichensis | Nativa | 1 |
| Pilea hyalina | Fenzl | M. Grayum 1277 | Nativa | 1 | |
| Pilea imparifolia | Wedd. | B. Hammel 12829 | Nativa | - | |
| Pilea microphylla | (L.) Liebm. | Aguilar 8066 | Nativa | 6 | |
| Pilea nummulariifolia | (Sw.) Wedd. | J. González 7645 | Exótica | 7 | |
| Pilea pittieri | Killip | B. Hammel 12109 | Nativa | 6 | |
| Pilea pteropodon | Wedd. | Hammel 8648 | Sin. Pilea ptericlada Donn. Sm. | Nativa | 2 |
| Pinus caribaea | Morelet | B. Hammel 17441 | Exótica | 12 | |
| Pinzona coriacea | Mart. & Zucc. | Aguilar 7885, LSCR. | Sin. Doliocarpus coriaceus (Mart. & Zucc.) Gilg | Nativa | 20 |
| Piper aduncum | L. | Hammel 12742, 8054 | Nativa | 6 | |
| Piper albuginiferum | Trel. | Moran & Quijano 8174 (HUA) | Hist. Tax. Piper hispidum | Nativa | - |
| Piper arcteacuminatum | Trel. | Hammel 8335 | Sin. Piper dolichotrichum, Hist. Tax. “Hairy climber” | Nativa | 4 |
| Piper asymmetricum | C. DC. | Hammel 8837 | Sin. Piper aequale Vahl (pro parte) | Nativa | - |
| Piper auritifolium | Trel. | Hammel 8183 | Hist. Tax. “Forest biggie” | Nativa | 8 |
| Piper auritum | Kunth | Grayum 2865 | Nativa | 1 | |
| Piper brevistylum | C. DC. | P. Biolley 7436 (G, IT, CR) | Hist. Tax. Piper glabrescens | Nativa | - |
| Piper cabagranum | C. DC. | Grayum 2853 | Sin. Piper aequale Vahl (pro parte) | Nativa | 5 |
| Piper carminis | Trel. | S. Hummel 35 | Hist. Tax. Piper sancti-felicis | Nativa | - |
| Piper concepcionis | Trel. | Hammel 8925 | Hist. Tax. Piper subsessilifolium | Nativa | 11 |
| Piper coronatibracteum | Trel. | Opler 730 (MO) | Hist. Tax. Piper hispidum | Nativa | - |
| Piper corozalanum | Trel. | O. Vargas 1783 (LSCR) | Sin. Piper arboreum Aubl. Hist. Tax. Piper obumbratifolium | Nativa | 6 |
| Piper corrugatum | Kuntze | Hammel 9344 | Sin. Piper riparense C. DC., Sin. Piper nemorense C. DC. | Nativa | - |
| Piper culebranum | C. DC. | Grayum 2867 | Hist. Tax. Piper colonense | Nativa | 12 |
| Piper curvipilum | Trel. | Hammel 12216, 12523 (MO) | Hist. Tax. Piper hispidum, Piper sp. F | Nativa | - |
| Piper cyanophyllum | Trel. | Grayum 2852 | Sin. Piper candelarianum C. DC., Hist. Tax. Piper phytolaccifolium | Nativa | 9 |
| Piper cyphophyllum | C. DC. | Opler 1595 (MO) | Hist. Tax. Piper terrabanum | Nativa | - |
| Piper darienense | C. DC. | Grayum 2868 | Nativa | 7 | |
| Piper decurrens | C. DC. | Hammel 8023 | Sin. Piper tenuimucronatum C. DC.? | Nativa | 8 |
| Piper dryadum | C. DC. | Greig 588 | Nativa | - | |
| Piper echeverrianum | Trel. | M. Grayum 2677 | Nativa | - | |
| Piper euryphyllum | C. DC. | Hammel 8073 | Sin. Piper longispicum C. DC. | Nativa | - |
| Piper evasum | Trel. | Hammel 11743 | Hist. Tax. Piper imperiale | Nativa | 6 |
| Piper flavescens | (C. DC.) Trel. | Hammel 12062 | Hist. Tax. Piper longicaudatum, “Philippe’s Pubescent” | Nativa | - |
| Piper friedrichsthalii | C. DC. | Hammel 8315 | Sin. Piper lanceifolium Kunth | Nativa | 6 |
| Piper garagaranum | C. DC. | Greig 543 | Nativa | 11 | |
| Piper generalense | Trel. | Aguilar 7771 | Sin. Piper arieianum C.DC., Sin. Piper machadoanum C. DC., Hist. Tax. Piper trigonum | Nativa | 8 |
| Piper holdridgeanum | W. C. Burger | Hammel 8132 | Nativa | 7 | |
| Piper jubatum | Trel. | Folsom 9291 (DUKE, MO) | Hist. Tax. Piper glabrescens | Nativa | - |
| Piper melanocladum | C. DC. | Hammel 8073 | Nativa | 9 | |
| Piper multiplinervium | C. DC. | Aguilar 7995 | Nativa | 25 | |
| Piper nudifolium | C. DC. | Aguilar 7698 | Nativa | 8 | |
| Piper otophorum | C. DC. | Hammel 8850 | Nativa | - | |
| Piper paulowniifolium | C. DC. | Aguilar 7680 | Sin. Piper schiedeanum Steud., Hist. Tax. P. carrilloanum, Piper vallicola | Nativa | 12 |
| Piper pavasense | Trel. | H. Hoyle 11 | Hist. Tax. Piper sancti-felicis | Nativa | - |
| Piper peltatum | L. | Aguilar 8061 | Sin. Lepianthes peltata (L.) Raf., Sin. Potomorphe peltata (L.) Miq. | Nativa | 13 |
| Piper pentagonum | Trel. | Wilbur 70192 | Sin. Piper cenocladum C. DC. (pro parte) | Nativa | 9 |
| Piper peracuminatum | C. DC. | Grayum 2850 | Hist Tax. “River Mother” | Nativa | 6 |
| Piper perbrevicaule | Yunck. | R. Wilbur 38499 | Hist. Tax. Piper polytrichum C. DC. (Callejas, marzo 1986.) | Nativa | 5 |
| Piper prismaticum | C. DC. | Hammel 8751 | Hist. Tax. Piper augustum | Nativa | 16 |
| Piper pseudobumbratum | C. DC. | Aguilar 8210 | Hist. Tax. "Sperry's Pride" | Nativa | 16 |
| Piper reticulatum | L. | Aguilar 7693 | Nativa | 16 | |
| Piper reventazonis | Trel. | Hammel 12281 (MO, DUKE) | Hist. Tax. Piper sancti-felicis | Nativa | - |
| Piper scintillans | Trel. | Hammel 11749 | Sin. Piper reventazonis Trel., Sin. Piper tsuritkubense Trel., Hist. Tax. Piper sancti-felicis | Nativa | 5 |
| Piper silvicola | C. DC. | Hammel 8087 | Hist. Tax. Piper biseriatum, Hist Tax. Piper ciliatifolium | Nativa | 10 |
| Piper silvivagum | C. DC. | Aguilar 7791 | Nativa | 11 | |
| Piper sinuatifolium | Trel. | Hammel 8949 | Hist. Tax. Piper terrabanum, Hist. Tax. Piper cyphophyllum, Hist. Tax. Piper variegatum | Nativa | 17 |
| Piper sp. B | ? | Grayum 2861 | Hist. Tax. “Swamp Big-leaf” | Nativa | - |
| Piper sp. D | ? | M. Grayum 2762, R. Wilbur 38621, 38959, 39267, 40554; “H/SF #1” | Hist. Tax. P. hispidum (pro parte) | Nativa | 6 |
| Piper sp. E | ? | A. Gómez D. 32 (DUKE); M. Grayum 3041; “H/SF #3” | Hist. Tax. P. hispidum (pro parte) | Nativa | - |
| Piper sp. F | ? | M. Grayum 2760, B. Hammel 11824, 12503; H/SF #4 | Hist. Tax. P. sancti-felicis (pro parte) | Nativa | - |
| Piper sp. G | ? | R. Wilbur 37342 | Hist. Tax. P. sancti-felicis (pro parte) | Nativa | - |
| Piper suberythrocarpum | C. DC. | Hammel 11730 (MO) | Hist. Tax. Piper hispidum, Piper sp. F | Nativa | - |
| Piper sublineatum | Kuntze | Aguilar 7681 | Sin. Piper biolleyi C. DC. | Nativa | 15 |
| Piper subzhorquinense | C. DC. Ex Trel. | Opler 1641 (MO) | Hist. Tax. Piper glabrescens | Nativa | - |
| Piper tonduzii | C. DC. | Aguilar 8120 | Nativa | 12 | |
| Piper tsuritkubense | Trel. | Opler 1000 (MO) | Hist. Tax. Piper sancti-felicis | Nativa | - |
| Piper umbellatum | L. | Hammel 10308 | Sin. Lepianthes umbellata (L.) Raf., Sin. Potomorphe umbellata (L.) Miq. | Nativa | - |
| Piper umbricola | C. DC. | Hammel 8870 | Hist. Tax. Piper glabratum, Hist. Tax. Piper virgulatorum ? “Dark Green” | Nativa | 8 |
| Piper urophyllum | C. DC. | Aguilar 7696 | Nativa | 10 | |
| Piper urostachyum | Hemsl. | Hammel 8105 | Nativa | 13 | |
| Piper xanthostachyum | C. DC. | Grayum 3042 | Sin. Piper unguiculiferum Trel., Sin. Piper pseudo-aduncum C. DC., Hist. Tax. “Lemon-lime Climber” | Nativa | 14 |
| Piper zhorquinense | C. DC. | Hammel 7971 | Hist. Tax. Piper glabrescens | Nativa | 9 |
| Piptocarpha poeppigiana | (DC.) Baker | Aguilar 7778, LSCR. | Sin. Piptocarpha chontalense Baker, Sin. Piptocarpha costaricensis Klatt | Nativa | 9 |
| Pisonia aculeata | L. | B. Hammel 9322 | Nativa | 4 | |
| Pitcairnia atrorubens | (Beer) Baker | I. Chacon 574 | Nativa | 11 | |
| Pitcairnia wendlandii | Baker | M. Grayum 2459 | Nativa | - | |
| Pityrogramma calomelanos | (L.) Link | Hammel 10666 | Nativa | 11 | |
| Platystele catiensis | Karremans & Bogarín | O. Vargas 1230 | Hist. Tax. Platystele lancilabris, Platystele oxyglossa | Nativa | 17 |
| Plectranthus scutellarioides | (L.) R. Br. | O. Vargas 1853 | Sin. Solenostemon scutellarioides (L.) Codd, Sin. Coleus blumei Benth. | Exótica | 13 |
| Pleiostachya leiostachya | (Donn. Sm.) Hammel | M. Grayum 2258 | Nativa | 2 | |
| Pleiostachya pruinosa | (Regel) K. Schum. | Aguilar 8148 | Nativa | 21 | |
| Pleopeltis bradeorum | (Rosenst.) L. D. GÛmez | M. Grayum 1446 | Sin. Polypodium bradeorum Rosenst., Pseudocolysis bradeorum (Rosenst.) L. D. Gómez | Nativa | 3 |
| Pleopeltis furfuraceum | (Schltdl. & Cham.) A.R. Sm. | Aguilar 7845 | Sin. Polypodium furfuraceum Schltdl. & Cham. | Nativa | 8 |
| Pleuranthodendron lindenii | (Turcz.) Sleumer | Aguilar 7617 | Sin. Pleuranthodendron mexicana (A. Gray) L. O. Williams | Nativa | 35 |
| Pleurothallis phyllocardioides | Schltr. | Aguilar 8299 | Sin. Zosterophyllanthos phyllocardioides (Sw.) Schltr. | Nativa | 14 |
| Pleurothallis pruinosa | Lindl. | M. Grayum 2210 | Nativa | 4 | |
| Plukenetia stipellata | L. J. Gillespie | Aguilar 8193, LSCR. | Hist. Tax. Plukenetia volubilis | Nativa | 20 |
| Pochota fendleri | (Seem.) W.S. Alverson & M.C. Duarte | O. Vargas 1626 | Sin. Bombacopsis quinata (Jacq.) Dugand, Sin. Pachira quinata (Jacq.) W.S. Alverson | Nativa de CR Plantada en LS | 8 |
| Polybotrya alfredii | Brade | M. Grayum 2511 | Nativa | 7 | |
| Polybotrya caudata | Kunze | Hammel 8810 | Nativa | 18 | |
| Polybotrya osmundacea | Humb. & Bonpl. ex Willd | M. Grayum 1317 | Nativa | 19 | |
| Polyclathra cucumerina | Bertol. | B. Hammel 7297, DUKE, MO. | Nativa | 10 | |
| Polygala paniculata | L. | Hammel 11536 | Nativa | 3 | |
| Polygonum hydropiperoides | Michx. | O. Vargas 1178 | Hist. Tax. P. punctatum | Nativa | 13 |
| Polygonum punctatum | Elliott | I. Chacón 932 | Nativa | - | |
| Polyphlebium diaphanum | (Kunth) Ebihara & Dubuisson | Hammel 11112 | Sin. Trichomanes diaphanum Kunth | Nativa | 6 |
| Polystachya foliosa | (Hook.) Rchb. f. | Folsom 9460 | Nativa | 5 | |
| Polystachya masayensis | Rchb. f. | Folsom 9196 | Nativa | 10 | |
| Polytaenium cajenense | (Desv.) Bendict | M. Grayum 2155 | Sin. Anthrophyum cajenense (Desv.) Spreng. | Nativa | 10 |
| Polytaenium feei | (W. Schaffn. ex Fée) Maxon | Hammel 10695 | Sin. Anthrophyum lanceolatum (L.) Kaulf. | Nativa | 10 |
| Polytaenium lineatum | (Sw.) J. Sm. | L D. Gómez 981 (CR) | Sin. Antrophyum lineatum (Sw.) Kaulf. | Nativa | - |
| Portulaca oleracea | L. | B. Hammel 12058 | Nativa | 12 | |
| Posoqueria grandiflora | Standl. | O. Vargas 1769 | Hist. Tax. Posoqueria maxima | Nativa | 6 |
| Posoqueria grandifructa | Hammel & C.M. Taylor | O. Vargas 586, Folsom 9100 | Hist. Tax. P. panamensis P. coriacea | Nativa | 21 |
| Posoqueria latifolia | (Rudge) Roem. & Schult. | Aguilar 7838 | Nativa | 36 | |
| Posoqueria robusta | Hammel & C.M. Taylor | Folsom 9172 | Hist. Tax. P grandiflora | Nativa | 11 |
| Potalia turbinata | Struwe & V. A. Albert | Aguilar 8216, LSCR. | Hist. Tax. Potalia amara Aubl. | Nativa | 15 |
| Pourouma bicolor | Mart. | Aguilar 7839 | Sin. Pourouma aspera Trécul | Nativa | 29 |
| Pourouma minor | Benoist | M. Grayum 2894 | Sin. Pourouma umbellifera W. C. Burger | Nativa | 7 |
| Pouteria belizensis | (Standl.) Cronquist | L. Campos 936 | Hist. Tax. Pouteria chiricana, Pouteria sp. A, Pouteria sp. 3 (Clarks) | Nativa | - |
| Pouteria bracteata | T.D. Penn. | O. Vargas 1596 | Hist. Tax. P. bulliformis | Nativa | 9 |
| Pouteria calistophylla | (Standl.) Baehni | B. Hammel 10933 | Hist. Tax. Pouteria standleyana | Nativa | 20 |
| Pouteria campechiana | (Kunth) Baehni | B. Hammel 9991 | Nativa | 9 | |
| Pouteria durlandii | (Standl.) Baehni | G. Hartshorn 1621 | Hist. Tax. Pouteria sp. 1 | Nativa | 25 |
| Pouteria filipes | Eyma | O. Vargas 1326 | Nativa | 3 | |
| Pouteria leptopedicellata | Pilz | O. Vargas 1311 | Nativa de CR Plantada en LS | 6 | |
| Pouteria reticulata | (Engl.) Eyma | B. Hammel 9047 | Sin. Pouteria unilocularis (Donn. Sm.) Baehni | Nativa | 17 |
| Pouteria silvestris | T. D. Penn. | G. Hartshorn 1430 | Nativa | 6 | |
| Pouteria sp. B | ? | Clark Indiv. #881 | Hist. Tax. Pouteria sp. 2 (Clark), Pouteria cf. reticulata | Nativa | - |
| Pouteria torta | (Mart.) Radlk. | Hartshorn 1111 | Sin. Pouteria neglecta Cronq. | Nativa | 17 |
| Pradosia atroviolacea | Ducke | O. Vargas 1310 | Nativa | 15 | |
| Preslianthus pittieri | (Standl.) Iltis & Cornejo | Aguilar 7780, LSCR. | Sin. Capparis pittieri Standl | Nativa | 35 |
| Prestoea decurrens | (H. Wendl. ex Burret) H. E. Moore | O. Vargas 728, LSCR. | Nativa | 31 | |
| Prestonia longifolia | (Sessé & Moç.) J. F. Morales | M. Grayum 2505, DUKE, MO. | Sin. Prestonia concolor (S. F. Blake) Woodson ex Standl. | Nativa | - |
| Prestonia mexicana | A. DC. | B.Hammel 8616, DUKE, LSCR. | Nativa | - | |
| Prestonia portobellensis | (Beurl.) Woodson | Aguilar 7857, LSCR. | Nativa | 24 | |
| Prestonia riverae | J. F. Morales | B. Hammel 8921, DUKE. | Nativa | - | |
| Prioria copaifera | Griseb. | O. Vargas 1396, LSCR. | Nativa de CR Plantada en LS | 6 | |
| Priva lappulacea | (L.) Pers. | R. Wilbur 64960, 66651 | Nativa | 3 | |
| Prosthechea abbreviata | (Schltr.) W.E.Higgins | B. Hammel 8039 | Sin. Encyclia abbreviata (Schltr.) Dressler | Nativa | 11 |
| Prosthechea chacaoensis | (Rchb. f.) W. E. Higgins | M. Grayum 993 | Sin. Encyclia chacaoensis (Rchb. f.) Dressler & G. E. Pollard | Nativa | 41 |
| Prosthechea fragrans | (Sw.) W. E. Higgins | Aguilar 8163 | Sin. Encyclia fragrans (Sw.) Lemée, Sin. Prosthechea chimborazoensis (Schltr.) W.E. Higgins | Nativa | 18 |
| Prosthechea pygmaea | (Hook.) W. E. Higgins | C. Todzia 8078 | Sin. Encyclia pygmaea (Hook.) Dressler | Nativa | 11 |
| Protium confusum | (Rose) Pittier | Hammel 8157, DUKE. | Hist. Tax. Protium costaricense | Nativa | 5 |
| Protium glabrum | (Rose) Engl. | Aguilar 7609, LSCR. | Nativa | 9 | |
| Protium panamense | (Rose) I.M. Johnst. | A. H. Gentry 78485 (MO), N. Zamora 3871, LSCR. | Nativa | 14 | |
| Protium pittieri | (Rose) Engl. | Aguilar 7610, LSCR. | Sin. Tetragastris tomentosa D. M. Porter | Nativa | 26 |
| Protium ravenii | D.M. Porter | O. Vargas 1309, LSCR. | Hist. Tax. Protium glabrum | Nativa | 16 |
| Pseudechinolaena polystachya | (Kunth) Stapf | Otis 2 | Nativa | - | |
| Pseudelephantopus spicatus | (Juss.) Vahl | M. Grayum 2738, DUKE. | Nativa | - | |
| Pseudelephantopus spiralis | (Less.) Cronq. | O. Vargas 611, LSCR. | Nativa | 1 | |
| Pseudobombax septenatum | (Jacq.) Dugand | O. Vargas 1390 | Nativa de CR Plantada en LS | 14 | |
| Pseudogynoxys chenopodioides | (Kunth) Cabrera | J. González 7733 | Nativa | 15 | |
| Pseudolmedia spuria | (Sw.) Griseb. | Aguilar 8339 | Nativa | 5 | |
| Pseudorhipsalis acuminata | Cufod. | Hammel 8680, Aguilar 8105, LSCR, DUKE. | Sin. Disocactus acuminatus (Cufod.) Kimnach, Hist. Tax. Disocatus ramulosus | Nativa | 7 |
| Psidium friedrichsthalianum | (O. Berg) Nied. | E. Castro 45 | Nativa de CR Plantada en LS | 12 | |
| Psidium guajava | L. | R. Wilbur 34162 | Nativa | 4 | |
| Psiguria triphylla | (Miq.) C. Jeffrey | Aguilar 8058 | Hist. Tax. Psiguria bignoniacea | Nativa | 13 |
| Psiguria warscewiczii | (Hook. f.) Wunderlin | Aguilar 7686, LSCR. | Sin. Anguria warscewiczii Hook.f. | Nativa | 11 |
| Psychopsis krameriana | (Rchb. f.) H. G. Jones | B. Hammel 10295 | Sin. Oncidium kramerianum Rchb. f. | Nativa | 1 |
| Psychotria acuminata | Benth. | Aguilar 8200 | Nativa | 15 | |
| Psychotria alfaroana | Standl. | Hammel 8107 | Nativa | 8 | |
| Psychotria angustiflora | K. Krause | Hammel 9282 | Sin. Psychotria mima Standl. | Nativa | - |
| Psychotria brachiata | Sw. | Hammel 8411 | Nativa | 16 | |
| Psychotria buchtienii | Standl. | G. Hartshorn 1521 | Hist. Tax. Psychotria officinalis | Nativa | 20 |
| Psychotria chagrensis | Standl. | Aguilar 7658 | Nativa | 9 | |
| Psychotria cooperi | Standl. | Hammel 8114 | Nativa | 20 | |
| Psychotria cyanococca | Seem. ex Dombrain | Aguilar 7739 | Sin. Psychotria pittieri Standl. | Nativa | 25 |
| Psychotria elata | (Sw.) Hammel | Hammel 8187 | Sin. Cephaelis elata Sw. | Nativa | 8 |
| Psychotria glomerulata | (Donn. Sm.) Steyerm. | Aguilar 7882 | Sin. Cephaelis glomerulata Donn. Sm. | Nativa | 23 |
| Psychotria gracilenta | Müll. Arg. | Hammel 9552 | Sin. Psychotria brachybotrya Mull. Arg. | Nativa | 12 |
| Psychotria graciliflora | Benth. | Aguilar 7628 | Nativa | 16 | |
| Psychotria grandis | Sw. | Hammel 9447 | Nativa | 7 | |
| Psychotria guapilensis | (Standl.) Hammel | Hammel 1117 | Sin. Cephaelis discolor Pol. | Nativa | 13 |
| Psychotria hebeclada | DC. | Hammel 8985 | Nativa | 14 | |
| Psychotria laselvensis | C. W. Ham. | Hammel 8706 | Nativa | 16 | |
| Psychotria luxurians | Rusby | Hammel 8295 | Nativa | 28 | |
| Psychotria marginata | Sw. | Aguilar 8022 | Nativa | 23 | |
| Psychotria microbotrys | Ruiz ex Standl. | Aguilar 8117 | Nativa | 20 | |
| Psychotria panamensis | Standl. | Aguilar 8209 | Sin. Psychotria grandistipula Merr. | Nativa | 20 |
| Psychotria pilosa | Ruiz & Pav. | Hammel 9532 | Sin. Psychotria costaricensis Pol. | Nativa | 9 |
| Psychotria poeppigiana | Müll. Arg. | Hammel 8180 | Sin. Cephaelis tomentosa (Aubl.) Vahl | Nativa | 9 |
| Psychotria psychotriifolia | (Seem.) Standl. | Hammel 9464 | Nativa | 21 | |
| Psychotria racemosa | Rich. | O. Vargas 569 | Sin. Psychotria racemosa (Aubl.) Raeusch. | Nativa | 14 |
| Psychotria stenostachya | Standl. | O. Vargas 1584 | Sin. Rudgea thyrsiflora Donn. Sm. | Nativa | 13 |
| Psychotria suerrensis | Donn. Sm. | Aguilar 7607 | Nativa | 24 | |
| Psygmorchis pusilla | (L.) Dodson & Dressler | Aguilar 7608 | Sin. Erycina pusilla (L.) N. H. Williams & M. W. Chase, Sin. Oncidium pusillum (L.) Rchb.f. | Nativa | 6 |
| Pteris altissima | Poir. | M. Grayum 1132 | Nativa | 13 | |
| Pteris propinqua | J. Agardh | M. Grayum 2095 | Nativa | 9 | |
| Pteris pungens | Willd. | M. Grayum 1245 | Nativa | 5 | |
| Pteris quadriaurita | Retz. | Biolley 6933 | Nativa | 4 | |
| Pteris tripartita | Sw. | M. Grayum 9995 | Exótica | 10 | |
| Pterocarpus hayesii | Hemsl. | Aguilar 8069, LSCR. | Hist. Tax Pterocarpus rohrii | Nativa | 29 |
| Pterocarpus officinalis | Jacq. | B. Hammel 12842, LSCR. | Nativa | 11 | |
| Pterocarpus sp. A | ? | Hammel 8822, DUKE. | Hist. Tax P. hayesii, P. rohrii | Nativa | 27 |
| Pueraria phaseoloides | (Roxb.) Benth. | O. Vargas 1281, LSCR. | Exótica | 19 | |
| Qualea polychroma | Stafleu | Hammel 12242 | Hist. Tax. Qualea paraensis | Nativa | 40 |
| Quararibea asterolepis | Pitter | Hammel 9101 | Hist. Tax. Quararibea funebris | Nativa | 13 |
| Quararibea bracteolosa | (Ducke) K. Schum. | Aguilar 7943 | Sin. Matisia bracteolosa Ducke | Nativa | 49 |
| Quararibea cordata | (Bonpl.) Vischer | O. Vargas 575 | Nativa de CR Plantada en LS | 33 | |
| Quararibea ochrocalyx | (K. Schum.) Vischer | Aguilar 8219 | Sin. Matisia ochrocalyx K. Schum. | Nativa | 12 |
| Quararibea parvifolia | Standl. | Hammel 8603 | Nativa | 15 | |
| Quararibea pendula | W. S. Alverson | O. Vargas 594 | Nativa de CR Plantada en LS | 15 | |
| Quararibea pumila | W. S. Alverson | Aguilar 7721 | Nativa | 18 | |
| Quiina macrophylla | Tul. | Grayum 2879 | Sin. Quina schippii Standl. | Nativa | 17 |
| Radiovittaria stipitata | (Kunze) E. H. Crane | M. Grayum 1998 | Sin. Vittaria stipitata Kunze | Nativa | 1 |
| Randia altiscandens | (Ducke) C. M. Taylor | Hammel 8053 | Sin. Randia pepoformis Dwyer | Nativa | 22 |
| Randia genipoides | Dwyer-ined. | Hammel 11093 | Nativa | 13 | |
| Randia grandifolia | (Donn. Sm.) Standl. | Hammel 8661 | Sin. Randia diversifolia Standl. | Nativa | 17 |
| Randia mira | Dwyer | O. Vargas 1361 | Nativa | 15 | |
| Raphia taedigera | (Mart.) Mart. | R. Robles 1916, INB. | Nativa de CR Plantada en LS | 7 | |
| Raritebe palicoureoides | Wernham | A. Gentry 78634 | Nativa | 2 | |
| Rauvolfia purpurascens | Standl. | Aguilar 7887, LSCR. | Nativa | 17 | |
| Razisea spicata | Oerst. | B. Hammel 10725, DUKE. | Nativa | - | |
| Razisea villosa | Gómez-Laur. & Hammel | Opler 1619, DUKE. | Nativa | 3 | |
| Razisea wilburii | McDade | Wilbur 38268, DUKE. | Nativa | 3 | |
| Reinhardtia gracilis | (H. Wendl.) Drude ex Dammer | Aguilar 7665, LSCR. | Nativa | 11 | |
| Reinhardtia simplex | (H. Wendl.) Drude ex Dammer | O. Vargas 748, LSCR. | Nativa | 22 | |
| Renealmia alpinia | (Rottb.) Maas | Hammel 9035 | Nativa | 21 | |
| Renealmia cernua | (Sw. ex Roem. & Schult.) J.F. Macbr. | Aguilar 7796 | Nativa | 21 | |
| Renealmia concinna | Standl. | Hammel 12078 | Nativa | 3 | |
| Renealmia costaricensis | Standl. | M. Grayum 1843 | Nativa | 8 | |
| Renealmia pluriplicata | Maas | Aguilar 7868 | Nativa | 16 | |
| Rhetinantha aciantha | (Rchb. f.) M. A. Blanco | Folsom 9676 | Sin. Maxillaria aciantha Rchb. f. | Nativa | 5 |
| Rhetinantha friedrichsthalii | (Rchb. f.) M. A. Blanco | Folsom 9134 | Sin. Maxillaria friedrichsthalii Rchb. f. | Nativa | 4 |
| Rhipsalis baccifera | (J. S. Mill.) Stearn | Aguilar 7581, LSCR. | Sin. Rhipsalis cassytha Gaertn. | Nativa | 9 |
| Rhodospatha pellucida | Croat & Grayum-ined. | B.Hammel 9517 | Hist. Tax. Rhodospatha forgetii | Nativa | 6 |
| Rhodospatha wendlandii | Schott | Aguilar 7813 | Nativa | 17 | |
| Rhodostemonodaphne kunthiana | (Nees) Rohwer | Aguilar 7588, LSCR. | Sin. Nectandra kunthiana (Nees) Kosterm., Sin. Ocotea cooperi C. K. Allen | Nativa | 20 |
| Rhynchosia erythrinoides | Schltdl. & Cham. | N. Zamora 4249, LSCR. | Nativa | 1 | |
| Rhynchospora contracta | (Nees) J. Raynal | B. Hammel 11882 | Sin. Rhynchospora micrantha Vahl | Nativa | - |
| Rhynchospora corymbosa | (L.) Britton | B. Hammel 12168 | Nativa | 4 | |
| Rhynchospora nervosa | (Vahl) Boeck. | R. Wilbur 40619 | Sin. Dichromena ciliata Vahl | Nativa | 8 |
| Rhynchospora pedersenii | Guagl. | R. Wilbur 37116, 70229 | Nativa | - | |
| Rhynchospora polyphylla | Vahl | B. Hammel 11905 | Nativa | - | |
| Rhynchospora radicans | (Schltdl. & Cham.) H. Pfeiff. | O. Vargas 1215 | Sin. Dichromena radicans Schltdl. & Cham. | Nativa | 8 |
| Richardia scabra | L. | J. Beach 85003 | Nativa | 2 | |
| Richeria dressleri | G.L. Webster | Aguilar 8116 | Hist. Tax. Richeria obovata | Nativa | 38 |
| Ricinus communis | L. | B. Hammel 11667, DUKE. | Exótica | 1 | |
| Rinorea deflexiflora | Bartlett | Hammel 10721 | Nativa | 7 | |
| Rivina humilis | L. | R. Wilbur 66559 | Nativa | 4 | |
| Rodriguezia compacta | Schltr. | E. Castro 11 | Nativa | 17 | |
| Ronabea emetica | (L. f.) A. Rich. | Hammel 9484 | Sin. Psychotria emetica L.f. | Nativa | 9 |
| Ronabea latifolia | Aubl. | Aguilar 8159 | Sin. Psychotria erecta (Aubl.) Standl. & Steyerm. | Nativa | 16 |
| Rottboellia cochinchinensis | (Lour.) Clayton | R. Wilbur 66452 | Exótica | 8 | |
| Rourea adenophora | S. F. Blake | Marquis & Vargas 334, DUKE, MO. | Hist. Tax. Rourea glabra | Nativa | 10 |
| Rourea suerrensis | Donn. Sm. | Hammel 9499, DUKE. | Nativa | 7 | |
| Rudgea cornifolia | (Kunth) Standl. | Hammel 11059 | Nativa | 17 | |
| Ruellia biolleyi | Lindau | O. Vargas 738, LSCR. | Nativa | 9 | |
| Ruellia blechum | L. | Hammel 8352, DUKE. | Sin. Blechum brownei Juss., Blechum pyramidatum (Lam.) Urb. | Nativa | 13 |
| Ruellia palustris | Durkee | O. Vargas 1411, LSCR. | Nativa | 6 | |
| Ruellia terminalis | (Nees) Wassh. | Hammel 8006, DUKE. | Sin. Ruellia metallica Leonard, Sin. Ruellia barbillana Cufod. | Nativa | 11 |
| Ruellia tubiflora | Kunth | O. Vargas 1527, LSCR. | Nativa | 9 | |
| Ryania speciosa | Vahl | G. Hartshorn 1161 | Nativa | 18 | |
| Sabicea panamensis | Wernham | Hammel 7994 | Nativa | 16 | |
| Sabicea villosa | Willd. ex Roem. & Schult. | Hammel 11072 | Nativa | 8 | |
| Saccharum officinarum | L. | B. Hammel 10604 | Exótica | - | |
| Sacciolepis indica | (L.) Chase | B.Hammel 8362 | Exótica | 3 | |
| Saccoloma inaequale | (Kunze) Mett. | J. MacDougal 977 | Sin. Saccoloma moranii A. Rojas, Sin. Davallia inaequalis Kunze | Nativa | 11 |
| Sacoglottis trichogyna | Cuatrec. | Aguilar 8091, LSCR. | Nativa | 39 | |
| Salacia multiflora | (Lam.) DC. | O. Vargas 1297, LSCR. | Nativa | 1 | |
| Salpichlaena volubilis | (Kaulf.) J. Sm. | Aguilar 7604 | Nativa | 6 | |
| Samanea saman | (Jacq.) Merr. | O. Vargas 1555, LSCR. | Hist. Tax. Pithecellobium saman | Nativa de CR Plantada en LS | 10 |
| Sambucus canadensis | L. | B. Hammel 8060, DUKE, MO. | Hist. Tax. Sambucus nigra | Nativa de CR Plantada en LS | 5 |
| Sanchezia parvibracteata | Sprague & Hutch. | O. Vargas 1709, LSCR. | Exótica | 6 | |
| Sansevieria trifasciata | Prain | J. González 8272 | Exótica | 8 | |
| Sapium glandulosum | (L.) Morong | Hammel 10947, DUKE, LSCR, MO. | Sin. Sapium aucuparium Jacq., Sin. Sapium jamaicense Sw., Sin. Sapium oligoneurum K. Schum. & Pittier | Nativa | 5 |
| Sapium laurifolium | (A. Rich.) Griseb. | B. Hammel 11082, DUKE, LSCR, MO. | Sin. Sapium pleiostachys K. Schum. & Pittier, Hist. Tax. Sapium aucuparium | Nativa | - |
| Sapranthus viridiflorus | G. E. Schatz | Aguilar 8000, LSCR. | Nativa | 29 | |
| Sarcopera sessiliflora | (Triana & Planch.) Bedell | Aguilar 7844 | Sin. Norantea sessiliflora Triana & Planch. | Nativa | 56 |
| Satyria panurensis | (Benth. ex Meisn) Hook.f. ex Nied. | A. Gentry 78578, MO. | Sin. Satyria elongata A. C. Sm. | Nativa | 14 |
| Saurauia yasicae | Loes. | G. Chaverri s. n., 29 sept. 1988,DUKE. | Nativa | 17 | |
| Sauvagesia erecta | L. | Hammel 8366 | Nativa | 9 | |
| Scaphosepalum microdactylum | Rolfe | Folsom 9442A | Nativa | 9 | |
| Scaphyglottis atwoodii | Dressler | C. Todzia 962 | Hist. Tax. Scaphyglottis gracilis | Nativa | - |
| Scaphyglottis behrii | (Rchb. f.) Benth. ex Hemsl. | Hist. Tax. Scaphyglottis graminifolia | Nativa | 4 | |
| Scaphyglottis bilineata | (Rchb. f.) Schltr. | O. Vargas 2078 | Nativa | 12 | |
| Scaphyglottis boliviensis | (Rolfe) B. R. Adams | Folsom 8904 | Sin. Scaphyglottis huebneri Schltr. | Nativa | 8 |
| Scaphyglottis imbricata | (Lindl.) Dressler | E. Castro 0029 | Sin. Hexisea imbricata (Lindl.) Dressler | Nativa | 18 |
| Scaphyglottis longicaulis | S. Watson | C. Todzia 1081 | Nativa | 16 | |
| Scaphyglottis minutiflora | Ames & Correll | M. Grayum 2154 | Nativa | 18 | |
| Scaphyglottis prolifera | Cogn. | Richardson 161 | Nativa | 15 | |
| Scaphyglottis subulata | Schltr. | Attwood 85-89 | Sin. Reichenbacanthus subulatus (Schltr.) Dressler, Hist. Tax. Reichenbacanthus reflexus | Nativa | 6 |
| Schefflera nicaraguensis | (Standl.) A. C. Sm. | B. Hammel 8304, DUKE. | Nativa | 17 | |
| Schistocarpha eupatorioides | (Fenzl) Kuntze | Grayum 2674, DUKE, LSCR. | Sin. Schistocarpha oppositifolia (Kuntze) Rydb. | Nativa | 5 |
| Schizolobium parahyba | (Vell.) S.F. Blake | J. González 8643, LSCR. | Nativa de CR Plantada en LS | 7 | |
| Schlegelia fastigiata | Schery | Hammel 8650 | Hist. Tax. Schlegelia sulfurea | Nativa | 6 |
| Schlegelia nicaraguensis | Standl. | Aguilar 7674 | Nativa | 37 | |
| Schlegelia parviflora | (Oerst.) Monach. | B. Hammel 8789 | Nativa | 17 | |
| Schnella guianensis | (Aubl.) Wunderlin | Hammel 9172, LSCR. | Sin. Bauhinia manca Standl., Bauhinia guianensis Aubl. | Nativa | 7 |
| Schnella outimouta | (Aubl.) Wunderlin | B. Hammel 12914, DUKE, MO. | Sin. Bauhinia outimouta Aubl. | Nativa | 36 |
| Scleranthus annuus | L. | B. Hammel 11535, DUKE. | Nativa | - | |
| Scleria latifolia | Sw. | B. Hammel 11958 | Nativa | 6 | |
| Scleria macrophylla | J. S. Presl & C. Presl | B.Hammel 8396 | Nativa | - | |
| Scleria melaleuca | Rchb. ex Schltdl. & Cham. | R. Wilbur 66723 | Sin. Scleria pterota C. Presl | Nativa | 3 |
| Scleria microcarpa | Nees ex Kunth | Hammel 8481 | Nativa | 13 | |
| Scleria secans | (L.) Urb. | Hammel 9342 | Nativa | 3 | |
| Scoparia dulcis | L. | B. Jacobs 2126 | Nativa | 6 | |
| Scutellaria galerita | Epling | B.Hammel 8674, DUKE, LSCR. | Hist. Tax. Scutellaria purpurascens | Nativa | 9 |
| Scutellaria sp. 1 | J. González 9021 | - | |||
| Sechium edule | (Jacq.) Sw. | B. Hammel 10041, DUKE. | Exótica | 3 | |
| Sechium pittieri | (Cogn.) C. Jeffrey | Aguilar 8287, LSCR. | Sin. Frantzia villosa Wunderlin, Hist. Tax. Sechium venosum, Hist. Tax.Sechium villosum | Nativa | 22 |
| Securidaca diversifolia | (L.) S. F. Blake | B.Hammel 12187 | Nativa | 25 | |
| Selaginella anceps | (C. Presl) C. Presl | M. Grayum 1483 | Nativa | 7 | |
| Selaginella arthritica | Alston | M. Grayum 1000 | Nativa | 5 | |
| Selaginella atirrensis | Hieron. | R. Wilbur 34820 | Nativa | 2 | |
| Selaginella bombycina | Spring | M. Grayum 2098 | Nativa | 9 | |
| Selaginella eurynota | A. Braun | O. Vargas 1116 | Nativa | 12 | |
| Selaginella flagellata | Spring | M. Grayum 1061 | Nativa | 5 | |
| Selaginella oaxacana | Spring | M. Grayum 2377 | Nativa | 14 | |
| Selaginella silvestris | Aspl. | Grayum 2902 | Nativa | - | |
| Selaginella umbrosa | Lem. ex Hieron. | M. Grayum 1937 | Nativa | 6 | |
| Senegalia hayesii | Benth. | Aguilar 8285, LSCR. | Nativa | 24 | |
| Senegalia multipinnata | Ducke | Aguilar 8140, LSCR. | Hist. Tax. A. tenuifolia | Nativa | 12 |
| Senna alata | (L.) Roxb. | R. Wilbur 39373, DUKE. | Sin. Cassia alata L. | Exótica | - |
| Senna cobanensis | (Britton) H.S. Irwin & Barneby | R. Wilbur 63310, DUKE. | Hist. Tax. Cassia leiophylla | Nativa | 2 |
| Senna obtusifolia | (L.) H. S. Irwin & Barneby | R. Wilbur 38210, DUKE. | Sin. Cassia obtusifolia (L.) H. S. Irwin & Barneby | Nativa | - |
| Senna papillosa | (Britton & Rose) H. S. Irwin & Barneby | O. Vargas 570, LSCR. | Sin. Cassia papillosa Britton & Rose, Hist. Tax. Cassia fruticosa | Nativa | 9 |
| Senna reticulata | (Willd.) H. S. Irwin & Barneby | O. Vargas 1383, LSCR. | Sin. Cassia reticulata Willd. | Nativa | 15 |
| Serjania atrolineata | C. Wright | Hammel 8459 | Nativa | - | |
| Serjania mexicana | (L.) Willd. | Hammel 11617 | Nativa | 3 | |
| Serjania pyramidata | Radlk. | Grayum 2753 | Sin. Serjania decapleuria Croat | Nativa | 7 |
| Serjania rhombea | Radlk | Chacon 1293 | Nativa | - | |
| Serpocaulon dissimile | (L.) A. R. Sm. | M. Grayum 2999 | Sin. Polypodium dissimile L. | Nativa | 5 |
| Serpocaulon loriciforme | (Rosenst.) A. R. Sm. | M. Grayum 1248 | Sin. Polypodium loriciforme Rosenst. | Nativa | 9 |
| Serpocaulon maritimum | (Hieron.) A. R. Sm. | M. Grayum 2827 | Sin. Polypodium maritimum Hieron. | Nativa | 6 |
| Serpocaulon triseriale | (Sw.) A. R. Sm. | M. Grayum 1416 | Sin. Polypodium triseriale Sw. | Nativa | 6 |
| Setaria paniculifera | (Steud.) E. Fourn. ex Hemsl. | B. Hammel 9803 | Nativa | 11 | |
| Setaria parviflora | (Poir.) Kerguélen | Hammel 9211 | Sin. Setaria geniculata P. Beauv. | Nativa | 4 |
| Sicydium tamnifolium | (Kunth) Cogn. | M. Grayum 2248, DUKE. | Nativa | 9 | |
| Sida hirsutissima | Mill. | Hammel 8447 | Hist. Tax. S. acuta | Nativa | 2 |
| Sida rhombifolia | L. | Hammel 8353 | Nativa | 8 | |
| Sida setosa | Mart. ex Colla | Hammel 8370 | Nativa | 3 | |
| Sievekingia suavis | Rchb. F | O. Vargas 2084 | Nativa | 21 | |
| Simarouba amara | Aubl. | O. Vargas 679 | Nativa | 35 | |
| Simira maxonii | (Standl.) Steyerm. | Aguilar 8011 | Sin. Sickingia maxonii Standl. | Nativa | 33 |
| Sinclairia polyantha | (Klatt) Rydb. | Hammel 8494, DUKE, LSCR. | Sin. Liabum polyanthum Klatt | Nativa | 11 |
| Siparuna cuspidata | (Tul.) A. DC. | Hartshorn 2249 | Hist. Tax. Siparuna guianensis | Nativa | 5 |
| Siparuna grandiflora | (Kunth) Perkins | Hammel 8070 | Sin. Siparuna tonduziana Perkins | Nativa | 14 |
| Siparuna pauciflora | (Beurl.) A. DC. | Aguilar 7924 | Nativa | 16 | |
| Siparuna thecaphora | (Poepp. & Endl.) A. DC. | Hammel 8196 | Sin. Siparuna andina Tul., Sin. Siparuna macra Standl., Sin. Siparuna nicaraguensis Hemsl. | Nativa | 8 |
| Sloanea geniculata | Dam. A. Sm. | Aguilar 8016, LSCR. | Hist. Tax. Sloanea faginea Standl. | Nativa | 18 |
| Sloanea guianensis | (Aubl.) Benth. | B. Hammel 12921, DUKE. | Hist. Tax. Sloanea meianthera Donn. Sm. | Nativa | 7 |
| Sloanea laevigata | Dam. A. Sm. | Hammel 11654, DUKE, CAS, CR, F, GH, MO, NY, US. | Hist. Tax. Sloanea latifolia (Rich.) K. Schum. | Nativa | 16 |
| Sloanea medusula | K. Schum. & Pittier | Aguilar 8199, LSCR. | Nativa | 22 | |
| Sloanea rugosa | Dam. A. Sm. | Smith 1224, DUKE. | Nativa | - | |
| Sloanea tuerckheimii | Donn. Sm. | B. Hammel 11490, DUKE. | Nativa | - | |
| Smilax domingensis | Willd. | Hammel 8600 | Nativa | 16 | |
| Smilax febrifuga | Kunth | I. Chacón 992, D. Solano 1410 | Sin. Smilax panamensis Morong | Nativa | 9 |
| Smilax mollis | Humb. & Bonpl. ex Willd. | I. Chacon 1342 | Nativa | 11 | |
| Smilax officinalis | Kunth | Hammel 8387 | Sin. Smilax vanilliodora F. W. Apt | Nativa | 25 |
| Sobralia chrysostoma | Dressler | Folsom 10126 | Hist. Tax. Sobralia powellii, Sobralia leucoxantha | Nativa | 49 |
| Sobralia decora | Bateman | Aguilar 8324 | Nativa | 34 | |
| Sobralia fragrans | Lindl. | M. Grayum 2942 | Nativa | 17 | |
| Sobralia mucronata | Ames | E. Castro 0026 | Nativa | 13 | |
| Socratea exorrhiza | (Mart.) H. Wendl. | Aguilar 7719, LSCR. | Sin. Socratea durissima (Oerst.) H. Wendl. | Nativa | 4 |
| Solanum americanum | Mill. | Hammel 8783 | Nativa | 3 | |
| Solanum arboreum | Dunal | Aguilar 7694 | Sin. Solanum enchylozum Bitter | Nativa | 10 |
| Solanum aturense | Dunal | Hammel 8953 | Sin. Solanum siparunoides Ewan | Nativa | 5 |
| Solanum candidum | Lindl. | O. Vargas 1269 | Nativa | 12 | |
| Solanum circinatum | Bohs | Aguilar 7679 | Sin. Cyphomandra hartwegii (Miers) Dunal | Nativa | 17 |
| Solanum jamaicense | Mill. | Hammel 8640 | Nativa | 17 | |
| Solanum lepidotum | Dunal | Hammel 8469 | Hist. Tax. S. argenteum | Nativa | - |
| Solanum quitoense | Lam. | B. Hammel 10043 | Exótica | - | |
| Solanum rovirosanum | Donn. Sm. | J. González 6958 | Nativa | 10 | |
| Solanum rudepannum | Dunal | Hammel 8307 | Sin. Solanum ochraceoferrugineum (Dunal) Fern. | Nativa | 1 |
| Solanum rugosum | Dunal | Hammel 8448 | Nativa | 4 | |
| Solanum schlechtendalianum | Walp. | J. González 6884 | Nativa | 3 | |
| Solanum sessiliflorum | Dunal | M. Grayum 8657 | Nativa | 5 | |
| Solanum trizygum | Bitter | Hammel 7983 | Nativa | 3 | |
| Solanum volubile | Sw. | M. Grayum 2195 | Sin. Solanum adhaerens Roem. & Schult., Hist. Tax. Solanum lanceifolium | Nativa | 7 |
| Sommera donnell-smithii | Standl. | Nativa | 4 | ||
| Sorocea pubivena | Hemsl. | Aguilar 7611 | Nativa | 27 | |
| Souroubea gilgii | V. A. Richt. | R. Wilbur 40495 | Nativa | 26 | |
| Souroubea sympetala | Gilg | D. Smith 358 | Nativa | 12 | |
| Spachea correae | Cuatrec. & Croat | O. Vargas 1306 | Nativa | 31 | |
| Spananthe paniculata | Jacq. | B. Hammel 7858, DUKE, MO. | Nativa | 10 | |
| Sparattanthelium amazonum | Mart. | O. Vargas 564, LSCR. | Sin. Sparattanthelium septentrionale Sandwith | Nativa | 7 |
| Spathiphyllum friedrichsthalii | Schott | Hammel 7834 | Nativa | 6 | |
| Spathiphyllum fulvovirens | Schott | Hammel 8113 | Nativa | 9 | |
| Spathiphyllum laeve | Engl. | O. Vargas 624 | Nativa | 8 | |
| Spathiphyllum phryniifolium | Schott | Hammel & Trainer 11105 | Nativa | 8 | |
| Spathiphyllum wendlandii | Schott | Aguilar 7663 | Nativa | 15 | |
| Spathodea campanulata | P. Beauv. | O. Vargas 1373, LSCR. | Exótica | 22 | |
| Specklinia acrisepala | (Ames & C.Schweinf.)Pridgeon & M.W.Chase | J. Speery 647 | Sin. Pleurothallis acrisepala Ames & C. Schweinf, Sin. Sarcinula acrisepala (Ames & C. Schweinf.) Luer | Nativa | 15 |
| Specklinia aristata | (Hook.) Pridgeon & M.W.Chase | B. Hammel 8045 | Sin. Pleurothallis aristata Hook., Sin. Muscarella aristata (Hook.) Luer, Sin. Humboldtia aristata (Hook.) Kuntze | Nativa | - |
| Specklinia brighamii | (S .Watson) Pridgeon & M.W.Chase | I. Chacon 675 | Sin. Pleurothallis brighamii S. Watson, Sin. Sarcinula brighamii (S.Watson) Luer | Nativa | 5 |
| Specklinia corniculata | (Sw.) Steud. | Jacobs 2471 | Sin. Epidendrum corniculatum Sw., Sin. Pleurothallis corniculata (Sw.) Lindl. | Nativa | 16 |
| Specklinia grobyi | (Bateman ex Lindl.) F. Barros | M. Grayum 1905 | Sin. Pleurothallis grobyi Bateman ex Lindl. | Nativa | 4 |
| Specklinia guanacastensis | (Ames & C.Schweinf.) Pridgeon & M.W.Chase | Richardson 284 | Sin. Pleurothallis guanacastensis Ames & C. Schweinf | Nativa | 23 |
| Specklinia lugduno-batavae | Karremans, Bogarín & Gravend. | Folsom 8791, O. Vargas 2064 | Hist. Tax. Pleurothallis sp. A, Specklinia sp. A | Nativa | 21 |
| Specklinia microphylla | (A.Rich. & Galeotti) Pridgeon & M.W.Chase | M. Grayum 2211 | Sin. Pleurothallis microphylla A. Rich. & Galeotti | Nativa | 16 |
| Specklinia simmleriana | (Rendle) Luer | E. Castro 31 | Sin. Pleurothallis simmleriana Rendle, Sin. Sarcinula simmleriana (Rendle) Luer | Nativa | 23 |
| Specklinia vittariifolia | (Schltr.) Pridgeon & M.W. Chase | J. T. Atwood 85-127 | Hist. Tax. Pleurothallis glandulosa, Specklinia glandulosa | Nativa | 7 |
| Spermacoce exilis | (L.O. Williams) C.D. Adams ex W.C. Burger & C. M. | R. Wilbur 33425 | Sin. Borreria exilis L.O. Williams; Spermacoce mauritiana Gideon | Nativa | 3 |
| Spermacoce latifolia | Aubl. | Hammel 11024 | Sin. Borreria latifolia (Aubl.) K. Schum | Nativa | 3 |
| Spermacoce ocymifolia | Willd. ex Roem. & Schult. | Hammel 8368 | Sin. Borreria ocymifolia (Willd. ex Roem. & Schult.) Bacigalupo & E.L. Cabral, Hemidiodia ocymifolia (Willd. ex Roem. & Schult.) K. Schum. | Nativa | 14 |
| Spermacoce prostrata | Aubl. | Hammel 11015 | Sin. Borreria prostrata (Aubl.) Miq., Hist. Tax. Spermacoce gracilis, Hist. Tax. Borreria ocymoides | Nativa | 12 |
| Spermacoce remota | Lam. | J. González 7717, M. Grayum 1952 | Sin. Borreria assurgens (Ruiz & Pav.) Griseb.; B. remota (Lam.) Bacigalupo & E. L. Cabral; S. assurgens Ruiz & Pav. Hist. Tax. B. laevis | Nativa | - |
| Sphaeradenia acutitepala | Harling | B. Hammel 10782, DUKE, LSCR, MO. | Sin. Sphaeradenia carrilloana Grayum & Hammel | Nativa | 7 |
| Sphagneticola trilobata | (L.) Pruski | J. González 11596, LSCR. | Nativa | - | |
| Sphyrospermum buxifolium | Poepp. & Endl. | Aguilar 8472, LSCR. | Nativa | 16 | |
| Spigelia humboldtiana | Cham. & Schltdl. | Aguilar 8062, LSCR. | Sin. Spigelia palmeri Rose, Spigelia scabra Cham. & Schltdl. | Nativa | 18 |
| Spiracantha cornifolia | Kunth | R. Wilbur 38208, DUKE. | Nativa | 10 | |
| Spondias mombin | L. | O. Vargas 663, LSCR. | Nativa | 35 | |
| Spondias purpurea | L. | Jacobs 3164, DUKE. | Exótica | 3 | |
| Spondias radlkoferi | Donn. Sm. | Hammel 10497, MO. | Nativa | 35 | |
| Sporobolus indicus | (L.) R. Br. | R. Wilbur 37561, E. Judziewicz 4330 | Sin. Sporobolus poiretii (Roem. & Schult.) Hitchc., Hist. Tax. S. jacquemonti | Nativa | 7 |
| Sporobolus jacquemontii | Kunth | Judziewicz 4330 | Nativa | - | |
| Stachytarpheta cayennensis | (Rich.) Vahl | R. Wilbur 66858, O. Vargas 1523 | Hist. Tax. Stachytarpheta jamaicensis | Nativa de CR Plantada en LS | 9 |
| Stachytarpheta frantzii | Pol. | Aguilar 8429, G. Vargas 1268, T. McDowell 426 | Nativa de CR Plantada en LS | 27 | |
| Stanhopea ecornuta | Lem. | O. Vargas 710 | Nativa | 27 | |
| Stelis argentata | Lindl. | M. Grayum 2290 | Sin. Stelis endresii Rchb.f. | Nativa | 9 |
| Stelis hammelii | Luer | Aguilar 8172 | Hist. Tax. Stelis cleistogama | Nativa | 15 |
| Stelis lankesteri | Ames | E. Castro 61 | Hist. Tax. Stelis purpurea (Ruiz & Pav.) Willd. | Nativa | 10 |
| Stelis parvula | Lindl. | Folsom 9473 | Nativa | 17 | |
| Stelis superbiens | Lindl. | B. Hammel 9038 | Nativa | 24 | |
| Stemmadenia donnell-smithii | (Rose) Woodson | Aguilar 7787, LSCR. | Nativa | 29 | |
| Stemmadenia robinsonii | Woodson | Aguilar 8054, LSCR. | Nativa | 37 | |
| Stemodia angulata | Oerst. | O. Vargas 746 | Hist. Tax. Stemodia jorullensis | Nativa | 6 |
| Stemodia verticillata | (Mill.) Hassl. | O. Vargas 745 | Nativa | 5 | |
| Stenospermation angustifolium | Hemsl. | Aguilar 7840 | Nativa | 3 | |
| Stenospermation marantifolium | Hemsl. | O. Vargas 1376 | Nativa | 4 | |
| Stephanopodium costaricense | Prance | G. Chaverri 826, CR, K, MO. | Nativa | 3 | |
| Sterculia apetala | (Jacq.) H. Karst. | O. Vargas 2089 | Nativa | 7 | |
| Sterculia recordiana | Standl. | Hammel 8425 | Hist. Tax. Sterculia costaricana | Nativa | 29 |
| Sticherus ferrugineus | (Desv.) J. Gonzales | M. Grayum 1778 | Hist. Tax. Gleichenia bifida, Sticherus bifidus | Nativa | 10 |
| Stigmaphyllon lindenianum | A. Juss. | O. Vargas 699 | Nativa | 10 | |
| Stigmaphyllon puber | (Rich.) A. Juss. | B. Hammel 9325 | Hist. Tax. Stigmaphyllon puberum | Nativa | 7 |
| Stigmatopteris lechleri | (Mett.) C. Chr. | M. Jones 468. M. Jones 527 | Nativa | 6 | |
| Stigmatopteris longicaudata | (Liebm.) C. Chr. | M. Grayum 7910 | Nativa | 9 | |
| Stigmatopteris sordida | (Maxon) C. Chr. | Hammel & Fraser 11100 | Nativa | 7 | |
| Stizophyllum inaequilaterum | Bureau & K. Schum. | Aguilar 7886, LSCR. | Nativa | 12 | |
| Streptochaeta sodiroana | Hack. | Hammel 8056 | Nativa | 13 | |
| Stromanthe palustris | H. Kenn.-ined. | Kirchoff 6578 | Hist. Tax. Ctenanthe sp. | Nativa | 14 |
| Struchium sparganophorum | (L.) Kuntze | Hammel 8428, DUKE, LSCR. | Nativa | 15 | |
| Struthanthus cansjerifolius | (Oliv.) Eichler | M. Grayum 2163 | Nativa | - | |
| Struthanthus orbicularis | (Kunth) Blume | Hammel 12653, DUKE, MO. | Nativa | 4 | |
| Struthanthus woodsonii | Cufod. | Aguilar 7789, LSCR. | Hist. Tax. Struthanthus marginatus | Nativa | 9 |
| Strychnos panamensis | Seem. | Grayujm 2638, DUKE. | Sin. Strychnos tabascana Sprague & Sandw. | Nativa | 12 |
| Strychnos peckii | B.L. Rob. | O. Vargas 1690, LSCR. | Nativa | 3 | |
| Stryphnodendron microstachyum | Poepp. & Endl | Hammel 10498, DUKE. | Sin. Stryphnodendron excelsum Harms | Nativa | 30 |
| Swartzia costaricensis | (Britton) N. Zamora | R. Aguilar 7949, B. Hammel 8078, DUKE. | Hist. Tax. Swartzia simplex, Swartzia sp A. | Nativa | 23 |
| Swartzia nicaraguensis | (Britton & P. Wilson) Standl. | Hartshorn 1510, MO. | Hist. Tax. Swartzia cubensis | Nativa | 4 |
| Swartzia ochnacea | DC. | D. Solano 1154, Hammel 8816, DUKE, MO. | Hist. Tax. Swartzia simplex | Nativa | 1 |
| Symphonia globulifera | L. f. | Aguilar 7649 | Nativa | 15 | |
| Symplocos striata | Kriebel & N. Zamora | Hartshorn 1599, Hammel 9255 | Hist. Tax. S. panamensis, S. austin-smithii | Nativa | 22 |
| Synechanthus fibrosus | (H. Wendl.) H. Wendl. | B. Hammel 12471, DUKE, MO. | Nativa | 12 | |
| Synechanthus warscewiczianus | H. Wendl. | Aguilar 8270, LSCR. | Nativa | 44 | |
| Synedrella nodiflora | (L.) Gaertn. | Hammel 8244, DUKE, LSCR. | Nativa | 3 | |
| Syngonium hoffmannii | Schott | M. Grayum 2786 | Hist. Tax. Syngonium birdseyanum | Nativa | 13 |
| Syngonium macrophyllum | Engl. | Aguilar 7800 | Nativa | 25 | |
| Syngonium peliocladum | Schott | Aguilar 7933 | Sin. Syngonium podophyllum Schott var. peliocladum (Schott) Corat | Nativa | 28 |
| Syngonium rayi | Croat & Grayum | M. Grayum 2281 | Nativa | 6 | |
| Syngonium schottianum | H. Wendl. ex Schott | M. Grayum 8286 | Nativa | 27 | |
| Syngonium standleyanum | G. S. Bunting | M. Grayum 1838 | Nativa | 18 | |
| Syngonium triphyllum | Birdsey ex Croat | M. Grayum 2183 | Nativa | 6 | |
| Syzygium jambos | (L.) Alston | E. Salicetti 410 | Exótica | - | |
| Syzygium malaccense | (L.) Merr. & L. M. Perry | R. Wilbur 37467 | Sin. Eugenia malaccensis L. | Exótica | 9 |
| Tabebuia rosea | (Bertol.) DC. | M. Grayum 1393, DUKE. | Nativa | 9 | |
| Tabernaemontana amygdalifolia | Jacq. | Hammel & Stiles11142, DUKE, LSCR. | Nativa | 20 | |
| Tabernaemontana arborea | Rose | Hammel 11543, DUKE, LSCR, MO. | Sin. Peschiera arborea (Rose) Markgr. | Nativa | 8 |
| Tabernaemontana divaricata | (L.) R. Br. ex Roem. & Schult. | B. Hammel 11699, DUKE. | Sin. Nerium divaricatum L. | Exótica | - |
| Tachigali costaricensis | (N. Zamora & Poveda) N. Zamora & van der Werff | B. Hammel 10106, DUKE. | Sin. Sclerolobium costaricense N. Zamora & Poveda | Nativa | 6 |
| Tagetes erecta | L. | J. González 9017, LSCR. | Exótica | 5 | |
| Talisia nervosa | Radlk. | Hammel & Schatz 11578 | Nativa | 14 | |
| Tanaecium pyramidatum | (Rich.) L.G. Lohmann | O. Vargas 1519, LSCR. | Sin. Paragonia pyramidata (Rich.) Bureau | Nativa | 33 |
| Tapirira guianensis | Aubl. | O. Vargas 1268, LSCR. | Sin. Tapirira myriantha Triana & Planch., Hist. Tax. Trichilia moritzii | Nativa | 30 |
| Tarenaya longipes | (DC.) Iltis | Hammel 8089 | Sin. Cleome longipes DC. | Nativa | 5 |
| Tassadia obovata | Decne. | Hammel 10263, DUKE, LSCR. | Sin. Cynanchum recurvum (Rusby) Spellman | Nativa | 10 |
| Tectaria X chaconiana | A. Rojas | A. Rojas 4156 | [T. acutiloba × T. lizarzaburui] | Nativa | - |
| Tectaria acutiloba | (Hieron.) Maxon | Hammel 8791 | Hist. Tax. Tectaria mexicana | Nativa | 12 |
| Tectaria athyrioides | (Baker) C. Chr. | Hammel 10648 | Sin. Tectaria rheosora (Baker) C. Chr. | Nativa | 2 |
| Tectaria brauniana | (H. Karst.) C. Chr. | M. Grayum 1385 | Sin. Tectaria neotropica L. D. Gómez | Nativa | 8 |
| Tectaria draconoptera | (D. C. Eaton) Copel. | Hammel 8755 | Nativa | 8 | |
| Tectaria heracleifolia | (Willd.) Underw. | M. Grayum 9445 | Nativa | - | |
| Tectaria incisa | Cav. | M. Grayum 2067 | Hist. Tax. Tectaria lizarzaburui | Nativa | 16 |
| Tectaria nicotianifolia | (Baker) C. Chr | Hammel 8767 | Nativa | 8 | |
| Tectaria rivalis | (Mett. ex Kuhn) C. Chr. | M. Grayum 2707 | Nativa | 8 | |
| Tectaria rufovillosa | (Rosenst.) C. Chr. | M. Grayum 2647 | Nativa | 8 | |
| Tectona grandis | L. | O. Vargas 1186, LSCR. | Exótica | 9 | |
| Teramnus volubilis | Sw. | Aguilar 8497, LSCR. | Nativa | 1 | |
| Terminalia amazonia | (J. F. Gmel.) Exell | Aguilar 8292, LSCR. | Nativa | 19 | |
| Terminalia bucidoides | Standl. & L. 0. Williams | Hartshorn 1769, DUKE, MO. | Nativa | - | |
| Terminalia oblonga | (Ruiz & Pav.) Steud. | Aguilar 7632, LSCR. | Sin. Terminalia lucida Pittier | Nativa | 11 |
| Tetracera hydrophila | Triana & Planch. | R. Wilbur 66431 | Nativa | - | |
| Tetracera portobellensis | Beurl. | Aguilar 8276, LSCR. | Sin. Tetracera sessiliflora Triana & Planch. | Nativa | 20 |
| Tetragastris panamensis | (Engler) 0. Ktze. | Hammel 11108, DUKE, MO. | Nativa | 8 | |
| Tetrapterys schiedeana | Schltdl. & Cham. | O.Vargas 501, O. Vargas 1579 | Nativa | 12 | |
| Tetrapterys skutchii | W.R. Anderson | B. Hammel 12998 | Nativa | - | |
| Tetrapterys tinifolia | Triana & Planch. | G. Hartshorn 1277 | Sin. Tetrapterys donnell-smithii Small, Hist. Tax. Tetrapterys macrocarpa | Nativa | 7 |
| Tetrorchidium euryphyllum | Standl. | Hammel 11251, DUKE, LSCR, MO. | Nativa | 6 | |
| Tetrorchidium robledoanum | Cuatrec. | Hammel 8000, DUKE, LSCR, MO. | Sin. Tetrorchidium gorgonae Croizat | Nativa | 14 |
| Thelypteris angustifolia | (Willd.) Proctor | M. Grayum 2065 | Nativa | 6 | |
| Thelypteris balbisii | (Spreng.) Ching | M. Grayum 991 | Nativa | 10 | |
| Thelypteris biolleyi | (H. Christ) Proctor | M. Grayum 2749 | Nativa | 7 | |
| Thelypteris curta | (H. Christ) C. F. Reed | M. Grayum 1001 | Nativa | 11 | |
| Thelypteris decussata | (L.) Proctor | M. Grayum 1309 | Nativa | 10 | |
| Thelypteris dentata | (Forssk.) E. P. St. John | Hammel 10660 | Nativa | 16 | |
| Thelypteris eggersii | (Hieron.) C. F. Reed | I. Chacon 1241 | Nativa | - | |
| Thelypteris falcata | (Liebm.) R. M. Tryon | M. Grayum 2273 | Nativa | 9 | |
| Thelypteris francoana | (E. Fourn.) C. F. Reed | M. Grayum 1335 | Nativa | 8 | |
| Thelypteris ghiesbreghtii | (Hook.) C. V. Morton | Hammel 10692 | Nativa | 10 | |
| Thelypteris gigantea | (Mett.) R. M. Tryon | M. Grayum 2318 | Nativa | 7 | |
| Thelypteris hispidula | (Decne.) C. F. Reed | M. Grayum 2408 | Nativa | 7 | |
| Thelypteris leprieurii | (Hook.) R. M. Tryon | B. Hammel 11476 | Nativa | 5 | |
| Thelypteris lingulata | (C. Chr.) C. V. Morton | Hammel 10655 | Nativa | 14 | |
| Thelypteris nicaraguensis | (E. Fourn.) C. V. Morton | Hammel 10691 | Nativa | 13 | |
| Thelypteris opulenta | (Kaulf.) Fosberg | M. Jones 295, M. Jones 362 | Nativa | 2 | |
| Thelypteris poiteana | (Bory) Proctor | M. Grayum 2713 | Nativa | 10 | |
| Thelypteris resinifera | (Desv.) Proctor | Hammel 11076 | Nativa | 5 | |
| Thelypteris serrata | (Cav.) Alston | M. Grayum 2325 | Exótica | 12 | |
| Thelypteris urbanii | (Sodiro) A. R. Sm. | M. Grayum 2764 | Nativa | 9 | |
| Thelypteris villana | L. D. Gómez | I. Chacon 1233 | Sin. Thelypteris pseudoaspidioides L. D. Gómez | Nativa | - |
| Theobroma bicolor | Bonpl. | J. González 8641 | Nativa de CR Plantada en LS ? | 5 | |
| Theobroma cacao | L. | O. Vargas 1566 | Exótica | 29 | |
| Theobroma mammosum | Cuatrec. & Jorge León | O. Vargas 1308 | Nativa | 18 | |
| Theobroma simiarum | Donn. Sm. | Aguilar 7883 | Nativa | 26 | |
| Thevetia peruviana | (Pers.) K. Schum. | J. González 7643, LSCR. | Exótica | 7 | |
| Thunbergia alata | Bojer ex Sims | R. Wilbur 34498, DUKE. | Exótica | 9 | |
| Thunbergia erecta | (Benth.) T. Anderson | J. González 8262, LSCR. | Exótica | 9 | |
| Thunbergia fragrans | Roxb. | J. González 7715, LSCR. | Exótica | 6 | |
| Thunbergia grandiflora | Roxb. | O. Vargas 1138, LSCR. | Exótica | 9 | |
| Tibouchina longifolia | (Vahl) Baill. | Hammel 8367 | Nativa | 7 | |
| Tillandsia anceps | Lodd. | B. Hammel 7989 | Nativa | 18 | |
| Tillandsia bulbosa | Hook. | Hammel 10671 | Nativa | 11 | |
| Tillandsia festucoides | Brongn. ex Mez | Hammel 8286 | Nativa | 9 | |
| Tillandsia leiboldiana | Schltdl. | O. Vargas 1227 | Nativa | 9 | |
| Tillandsia monadelpha | (E. Morren) Baker | Hammel 8279 | Nativa | 10 | |
| Tillandsia pruinosa | Sw. | I. Chacon 810 | Nativa | - | |
| Tillandsia usneoides | (L.) L. | Hammel 10635 | Nativa | - | |
| Tillandsia venusta | Mez & Wercklé | B. Hammel 11446 | Nativa | - | |
| Tococa guianensis | Aubl. | B. Hammel 11481 | Nativa | 16 | |
| Tontelea hondurensis | A. C. Sm. | O. Vargas 1296, LSCR. | Nativa | 5 | |
| Torenia crustacea | (L.) Cham. & Schltdl. | B. Hammel 10033 | Sin. Lindernia crustacea (L.) F. Muell. | Nativa | 4 |
| Torenia thouarsii | (Cham. & Schltdl.) Kuntze | R. Wilbur 65149 | Sin. Lindernia thouarsii (Cham. & Schltdl.) Edwin | Exótica | 4 |
| Tournefortia angustiflora | Ruiz & Pav. | O. Vargas 1119, LSCR. | Nativa | 16 | |
| Tournefortia glabra | L. | Hammel 8452, LSCR. | Nativa | 7 | |
| Tournefortia hirsutissima | L. | O. Vargas 1784, LSCR. | Nativa | 4 | |
| Tournefortia sp. A | ? | O. Vargas 1265, B. Hammel 17330 | Hist, Tax. T. hirsutissima sensu Miller | Nativa | 9 |
| Tovomita weddelliana | Planch. & Triana | Hammel 7953 | Nativa | 3 | |
| Toxosiphon lindenii | Baill. | Hammel 11464, Duke | Sin. Erythrochiton lindenii (Baill.) Hemsl. | Nativa | 10 |
| Tradescantia schippii | D. R. Hunt | Hammel 8164, DUKE, LSCR. | Sin. Zebrina huehueteca Standl. & Steyerm., Sin. Tradescantia huehueteca (Standl. & Steyerm.) D. R. Hunt | Nativa | 9 |
| Tradescantia zanonia | (L.) Sw. | Aguilar 7589, LSCR. | Sin. Campelia zanonia (L.) Kunth | Nativa | 12 |
| Tradescantia zebrina | hort. ex Bosse | J. González 7646, LSCR. | Sin. Zebrina pendula Schnizl. | Nativa de CR Plantada en LS | 9 |
| Trema integerrima | (Beurl.) Standl. | Grayum 2877, LSCR, MO. | Nativa | 23 | |
| Trema micrantha | (L.) Blume | R. Wilbur 37775, MO. | Nativa | 4 | |
| Trichilia pallida | Sw. | M. Grayum 2181 | Nativa | 2 | |
| Trichilia septentrionalis | C. DC. | Hammel & Trainer 10807 | Sin. Trichilia moritzii C. DC., Sin. Trichilia polyneura C. DC. | Nativa | 20 |
| Trichomanes botryoides | Kaulf. | B. Hammel 11461 | Hist. Tax. Trichomanes osmundoides | Nativa | - |
| Trichomanes crispum | L. | Barcock A84, M. Jones 605 | Nativa | 6 | |
| Trichomanes diversifrons | (Bory) Mett. ex Sadeb. | Hammel 10250 | Nativa | 4 | |
| Trichomanes elegans | Rich. | Hammel 8091 | Nativa | 4 | |
| Trichomanes pinnatum | Hedw. | Hammel 10728 | Nativa | 11 | |
| Trichomanes tuerckheimii | H. Christ | M. Grayum 1901 | Nativa | 4 | |
| Trichosalpinx blaisdellii | (S. Watson) Luer | I. Chacón 1086 | Sin. Pleurothallis blaisdellii S. Watson | Nativa | 14 |
| Trichosalpinx dura | (Lindl.) Luer | J. Luteyn 2983 | Sin. Pleurothallis dura Lind., Sin. Trichosalpinx foliata (Griseb.) Lindl. | Nativa | 4 |
| Trichosalpinx orbicularis | (Lindl.) Luer | Jacobs 2903 | Sin. Pleurothallis orbicularis (Lindl.) Lindl. | Nativa | 4 |
| Trichospermum lessertianum | (Hochr.) Dorr | Hammel 11666 | Hist. Tax. Trichospermum grewiifolium | Nativa | 7 |
| Trichostigma octandrum | (L.) H. Walter | Jacobs 2328 | Nativa | 43 | |
| Trichostigma polyandrum | (Loes.) H. Walter | Aguilar 7627 | Nativa | 13 | |
| Tridax procumbens | L. | N. Zamora 3924, LSCR. | Nativa | 12 | |
| Trigonidium egertonianum | Bateman ex Lindl. | Aguilar 8282 | Nativa | 41 | |
| Trigonidium seemannii | Rchb. f. | M. Grayum 2493 | Sin. T. riopalenquense | Nativa | 15 |
| Triolena hirsuta | (Benth.) Triana | Aguilar 7701 | Nativa | 11 | |
| Tripogandra serrulata | (Vahl) Handlos | Hammel 8239, DUKE, LSCR. | Nativa | 7 | |
| Tristicha trifaria | (Bory ex Willd.) Spreng. | O. Vargas 561 | Sin. Tristicha hypnoides (A. St.-Hil.) Spreng | Nativa | 1 |
| Triumfetta lappula | L. | R. Wilbur 65028 | Nativa | 4 | |
| Trophis involucrata | W. C. Burger | Aguilar 7618 | Nativa | 20 | |
| Trophis racemosa | (L.) Urb. | Aguilar 7799 | Nativa | 30 | |
| Uleiorchis ulaei | (Cogn.) Handro | B. Hammel 11657 | Nativa | - | |
| Uncaria tomentosa | (Willd.) DC. | Hammel 11599 | Nativa | 19 | |
| Unonopsis hammelii | G. E. Schatz & Maas | Hammel 9423, MO. | Nativa | 4 | |
| Unonopsis pittieri | Saff. | Hammel 10592, MO. | Sin. Unonopsis schippii R. E. Fr. | Nativa | 10 |
| Unonopsis sp. A | ? | O. Vargas 1294, LSCR. | Nativa | 2 | |
| Urena lobata | L. | B. Hammel 11525 | Nativa | 17 | |
| Urera baccifera | (L.) Gaudich. ex Wedd. | Hammel 8156 | Nativa | 16 | |
| Urera caracasana | (Jacq.) Gaudich. ex Griseb. | Grayum 1324 | Sin. Urera alceifolia Gaudich. | Nativa | 1 |
| Urera laciniata | (Goudot) Wedd. | Hammel 8242 | Nativa | 7 | |
| Urera lianoides | A.K. Monro & Al. Rodr. | Hammel 9519 | Hist. Tax. Urera eggersii, U. sp. A (según M. Grayum), U. lianiformis | Nativa | 7 |
| Urera simplex | Wedd. | O. Vargas 620 | Sin. Urera rzedowskii V.W. Steinm, . Hist. Tax. U. corallina, U. elata | Nativa | 28 |
| Urochloa fusca | (Sw.) B.F. Hansen & Wunderlin | Hammel 12451, Hammel 9244 | Sin. Urochloa fasciculata (Sw.) R. D. Webster, Sin. Brachiaria fasciculata (Sw.) Parodi, Sin. Panicum fasciculatum Sw. | Nativa | - |
| Urochloa mutica | (Forssk.) T. Q. Nguyen | Hammel 8313 | Sin. Brachiaria mutica (Forssk.) T. Q. Nguyen, Sin. Panicum purpurascens Raddi | Exótica ? | - |
| Urochloa ruziziensis | (R. Germ. & Evrard) Morrone & Zuloaga | Hammel 12886 | Sin. Brachiaria ruziziensis R. Germ. & Evrard | Exótica | - |
| Urospatha grandis | Schott | Hammel 8337 | Sin. Urospatha tonduzii Engl., Sin. Urospatha friedrichsthalii Schott | Nativa | 7 |
| Vachellia ruddiae | D. H. Janzen | Aguilar 8485, LSCR. | Nativa | 10 | |
| Vandellia diffusa | L. | Folsom 8839 | Sin. Lindernia diffusa (L.) Wettst. | Exótica | 2 |
| Vandenboschia collariata | (Bosch) Ebihara & K. Iwats. | Hammel 11116 | Sin. Trichomanes collariatum Bosch | Nativa | 15 |
| Vanilla hartii | Rolfe | O. Vargas 2138, LSCR | Nativa | - | |
| Vanilla odorata | C. Prest | O. Vargas 1198 | Nativa | 38 | |
| Vanilla trigonocarpa | Hoehne | B. Hammel 10463 | Sin. Vanilla pauciflora Dressler | Nativa | - |
| Varronia dichotoma | Ruiz & Pav. | O. Vargas 1273, LSCR. | Sin. Cordia bifurcata Roem. & Schult. | Nativa | 9 |
| Verbena litoralis | Kunth | J. González 1597, LSCR | Nativa | - | |
| Vernonanthura patens | (Kunth) H. Rob. | Hammel 8435 | Sin. Vernonia patens Kunth | Nativa | 7 |
| Vigna vexillata | (L.) A. Rich. | McDowell 254, DUKE. | Nativa | 4 | |
| Virola koschnyi | Warb. | Aguilar 7600 | Nativa | 19 | |
| Virola sebifera | Aubl. | Hammel 10623 | Nativa | 36 | |
| Vismia baccifera | (L.) Triana & Planch. | Aguilar 8255, LSCR. | Sin. Vismia panamensis Duchass. & Walp. | Nativa | 16 |
| Vismia billbergiana | Beurl. | Aguilar 8218, LSCR. | Nativa | 8 | |
| Vismia macrophylla | Kunth | B.Hammel 9830, DUKE, MO. | Nativa | 16 | |
| Vitex cooperi | Standl. | Aguilar 7940, LSCR. | Nativa | 30 | |
| Vitis tiliifolia | Humb. & Bonpl. ex Roem. & Schult. | Hammel 8863 | Nativa | 14 | |
| Vittaria lineata | (L.) Sm. | Aguilar 7788 | Nativa | 7 | |
| Vochysia ferruginea | Mart. | Hammel 9226 | Nativa | 15 | |
| Vochysia guatemalensis | Donn. Sm. | Hartshorn 1221 | Sin. Vochysia hondurensis Sprague | Nativa | 5 |
| Volkameria ligustrina | Jacq. | O. Vargas 1517, LSCR. | Sin. Clerodendrum ligustrinum (Jacq.) R. Br. | Nativa de CR Plantada en LS | 12 |
| Vouarana anomala | (Steyerm.) Acev.-Rodr | B.Hammel 11109 | Nativa | 7 | |
| Voyria tenella | Hook. | Aguilar 8753, LSCR. | Hist. Tax. Voyria sp. A | Nativa | 10 |
| Vriesea heliconioides | Kunth | B. Hammel 2174 | Nativa | 6 | |
| Warrea costaricensis | Schltr. | B. Hammel 10161 | Nativa | 14 | |
| Warszewiczia coccinea | (Vahl) Klotzsch | Hammel 8819 | Nativa | 5 | |
| Weberocereus tunilla | (F. A. C. Weber) Britton & Rose | Aguilar 7753 | Sin. Cereus tunilla F. A. C. Weber | Nativa | 18 |
| Welfia regia | H. Wendl. ex André | T. Croat 44237, DUKE. | Sin. W. georgii H. Wendl. ex Burret | Nativa | 17 |
| Werauhia gladioliflora | (H. Wendl.) J. R. Grant | Aguilar 7586 | Sin. Vriesea gladioliflora (H. Wendl.) Antonie | Nativa | 22 |
| Werauhia kupperiana | (Suess.) J. R. Grant | McDowell 242 | Sin. Vriesea kupperiana Suess. | Nativa | 22 |
| Werauhia ringens | (Griseb.) J. R. Grant | M. Grayum 2473 | Sin. Vriesea ringens (Griseb.) Harms | Nativa | - |
| Wissadula excelsior | (Cav.) C. Presl | Grayum 2680 | Nativa | 2 | |
| Witheringia asterotricha | (Standl.) Hunz. | Aguilar 7670 | Nativa | 14 | |
| Witheringia meiantha | (Donn. Sm.) Hunz. | Hammel 8108 | Hist. Tax. Witheringia solanacea | Nativa | 17 |
| Xanthosoma mexicanum | Liebm. | B. Hammel 11073 | Nativa | 11 | |
| Xanthosoma robustum | Schott Folsom 9963 | B. Hammel 9718 | Nativa | - | |
| Xanthosoma sagittifolium | (L.) Schott | O. Vargas 1538 | Sin. Xanthosoma nigrum Stellfeld, Sin. Xanthosoma roseum Schott, Sin. Xanthosoma violaceum Schott | Exótica | 12 |
| Xanthosoma undipes | (K. Koch & C. D. Bouché) K. Koch | B. Hammel 8015 | Hist. Tax. Xanthosoma jacquinii Schott | Nativa | 7 |
| Xiphidium caeruleum | Aubl. | Aguilar 8153, LSCR. | Nativa | 17 | |
| Xylopia bocatorena | Schery | Aguilar 7615, LSCR. | Nativa | 10 | |
| Xylopia sericophylla | Standl. & L. 0. Williams | B.Hammel 8629, DUKE. | Nativa | 8 | |
| Xylosma chlorantha | Donn. Sm. | Hammel 11576 | Nativa | 5 | |
| Xylosma hispidula | Standl. | E. Salicetti 486, LSCR. | Nativa | - | |
| Youngia japonica | (L.) DC. | O. Vargas 1210, LSCR. | Nativa | 21 | |
| Zamia neurophyllidia | D. W. Stev. | O. Vargas 719 | Hist. Tax. Zamia skinneri | Nativa | 16 |
| Zanthoxylum panamense | P. Wilson | O. Vargas 750 | Nativa | 7 | |
| Zanthoxylum riedelianum | Engl. | Hartshorn 1810 | Sin. Zanthoxylum kellermanii P. Wilson, Sin. Zanthoxylum mayanum Standl. | Nativa | 17 |
| Zexmenia virgulta | Klatt | Grayum 2673, DUKE, LSCR, MO. | Nativa | 6 | |
| Zingiber spectabile | Griff. | J. González 7647 | Exótica | 5 | |
| Zygia gigantifoliola | (Schery) L. Rico | Aguilar 7866, LSCR. | Sin. Pithecellobium gigantifoliolum (Schery) Jorge León | Nativa | 25 |
| Zygia longifolia | (Humb. & Bonpl.) Britton & Rose | Aguilar 7766, LSCR. | Sin. Pithecellobium longifolium (Humb. & Bonpl.) Standl. | Nativa | 40 |