| Abdra brachycarpa | Greene | Brassicaceae | 8 |
| Abildgaardia ovata | (Burm.f.) Kral | Cyperaceae | 8 |
| Acaciella angustissima | (Mill.) Britton & Rose | Fabaceae | 8 |
| Acalypha chamaedrifolia | (Lam.) Müll.Arg. | Euphorbiaceae | 8 |
| Acalypha gracilens | A.Gray | Euphorbiaceae | 8 |
| Acalypha persimilis | Müll.Arg. | Euphorbiaceae | 8 |
| Acalypha rhomboidea | Raf. | Euphorbiaceae | 8 |
| Acanthocereus tetragonus | (L.) Hummelinck | Cactaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Acer rubrum | L. | Sapindaceae | 8 |
| Acer saccharinum | L. | Sapindaceae | 8 |
| Acer saccharum | Marshall | Sapindaceae | 8 |
| Achyranthes aspera | L. | Amaranthaceae | 8 |
| Acmella repens | Rich. ex Pers. | Asteraceae | 8 |
| Acoelorraphe wrightii | (Griseb. & H.Wendl.) H.Wendl. ex Becc. | Arecaceae | 8 |
| Acrostichum aureum | L. | Pteridaceae | 8 |
| Acrostichum danaeifolium | Langsd. & Fisch. | Pteridaceae | 8 |
| Actaea pachypoda | Elliott | Ranunculaceae | 8 |
| Adiantum capillus-veneris | L. | Pteridaceae | 8 |
| Adiantum tenerum | Sw. | Pteridaceae | 8 |
| Aeschynomene americana | L. | Fabaceae | 8 |
| Aeschynomene indica | L. | Fabaceae | 8 |
| Aesculus pavia | L. | Sapindaceae | 8 |
| Agalinis aphylla | (Nutt.) Raf. | Orobanchaceae | 8 |
| Agalinis divaricata | (Chapm.) Pennell | Orobanchaceae | 8 |
| Agalinis fasciculata | (Elliott) Raf. | Orobanchaceae | 8 |
| Agalinis filicaulis | (Benth.) Pennell | Orobanchaceae | 8 |
| Agalinis filifolia | (Nutt.) Raf. | Orobanchaceae | 8 |
| Agalinis harperi | Pennell | Orobanchaceae | 8 |
| Agalinis linifolia | (Nutt.) Britton | Orobanchaceae | 8 |
| Agalinis maritima | (Raf.) Raf. | Orobanchaceae | 8 |
| Agalinis obtusifolia | Raf. | Orobanchaceae | 8 |
| Agalinis purpurea | (L.) Pennell | Orobanchaceae | 8 |
| Agalinis setacea | (J.F.Gmel.) Raf. | Orobanchaceae | 8 |
| Agalinis tenuifolia | (Vahl) Raf. | Orobanchaceae | 8 |
| Agarista populifolia | (Lam.) Judd | Ericaceae | 8 |
| Agave decipiens | Baker | Asparagaceae | 8 |
| Agave virginica | L. | Asparagaceae | 8 |
| Ageratina altissima | (L.) R.M.King & H.Rob. | Asteraceae | 8 |
| Ageratina aromatica | (L.) Spach | Asteraceae | 8 |
| Ageratina jucunda | (Greene) Clewell & Wooten | Asteraceae | 8 |
| Agrimonia microcarpa | Wallr. | Rosaceae | 8 |
| Agrimonia rostellata | Wallr. | Rosaceae | 8 |
| Agrostis hyemalis | (Walter) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Agrostis perennans | (Walter) Tuck. | Poaceae | 8 |
| Agrostis scabra | Willd. | Poaceae | 8 |
| Aletris aurea | Walter | Nartheciaceae | 8 |
| Aletris farinosa | L. | Nartheciaceae | 8 |
| Aletris lutea | Small | Nartheciaceae | 8 |
| Aletris obovata | Nash | Nartheciaceae | 8 |
| Allium canadense | L. | Amaryllidaceae | 8 |
| Allium cuthbertii | Small | Amaryllidaceae | 8 |
| Alnus serrulata | (Aiton) Willd. | Betulaceae | 8 |
| Alopecurus carolinianus | Walter | Poaceae | 8 |
| Alvaradoa amorphoides | Liebm. | Picramniaceae | 8 |
| Amaranthus albus | L. | Amaranthaceae | 8 |
| Amaranthus hybridus | L. | Amaranthaceae | 8 |
| Amaranthus polygonoides | L. | Amaranthaceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia hispida | Pursh | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier arborea | (F.Michx.) Fernald | Rosaceae | 8 |
| Ammannia coccinea | Rottb. | Lythraceae | 8 |
| Ammannia latifolia | L. | Lythraceae | 8 |
| Amorpha fruticosa | L. | Fabaceae | 8 |
| Amorpha herbacea | Walter | Fabaceae | 8 |
| Ampelaster carolinianus | (Walter) G.L.Nesom | Asteraceae | 8 |
| Ampelopsis cordata | Michx. | Vitaceae | 8 |
| Amphicarpaea bracteata | (L.) Fernald | Fabaceae | 8 |
| Amphicarpum amphicarpon | (Pursh) Nash | Poaceae | 8 |
| Amphitecna latifolia | (Mill.) A.H.Gentry | Bignoniaceae | 8 |
| Amsonia ciliata | Walter | Apocynaceae | 8 |
| Amyris elemifera | L. | Rutaceae | 8 |
| Anchistea virginica | (L.) C.Presl | Blechnaceae | 8 |
| Andersonglossum virginianum | (L.) J.I.Cohen | Boraginaceae | 8 |
| Andira inermis | (W.Wright) Kunth ex DC. | Fabaceae | 8 |
| Andropogon bicornis | L. | Poaceae | 8 |
| Andropogon brachystachyus | Chapm. | Poaceae | 8 |
| Andropogon stolonifer | (Nash) Hitchc. | Poaceae | 8 |
| Andropogon virginicus | L. | Poaceae | 8 |
| Anemia adiantifolia | (L.) Sw. | Anemiaceae | 8 |
| Anemone berlandieri | Pritz. | Ranunculaceae | 8 |
| Anemonella thalictroides | Spach | Ranunculaceae | 8 |
| Angelica venenosa | (J.Greenway) Fernald | Apiaceae | 8 |
| Annona glabra | L. | Annonaceae | 8 |
| Anredera vesicaria | (Lam.) C.F.Gaertn. | Basellaceae | 8 |
| Antennaria plantaginifolia | (L.) Richardson | Asteraceae | 8 |
| Anthenantia rufa | Schult. | Poaceae | 8 |
| Anthenantia villosa | (Michx.) P.Beauv. | Poaceae | 8 |
| Apios americana | Medik. | Fabaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Apteria aphylla | (Nutt.) Barnhart ex Small | Burmanniaceae | 8 |
| Aquarius cordifolius | (L.) Christenh. & Byng | Alismataceae | 8 |
| Aquarius grandiflorus | (Cham. & Schltdl.) Christenh. & Byng | Alismataceae | 8 |
| Aquilegia canadensis | L. | Ranunculaceae | 8 |
| Aralia spinosa | L. | Araliaceae | 8 |
| Arenaria lanuginosa | (Michx.) Rohrb. | Caryophyllaceae | 8 |
| Argemone albiflora | Hornem. | Papaveraceae | 8 |
| Arisaema acuminatum | Small | Araceae | 8 |
| Arisaema dracontium | (L.) Schott | Araceae | 8 |
| Arisaema pusillum | (Peck) Nash | Araceae | 8 |
| Arisaema quinatum | (Nutt.) Schott | Araceae | 8 |
| Arisaema triphyllum | (L.) Schott | Araceae | 8 |
| Aristida beyrichiana | Trin. & Rupr. | Poaceae | 8 |
| Aristida condensata | Chapm. | Poaceae | 8 |
| Aristida gyrans | Chapm. | Poaceae | 8 |
| Aristida lanosa | Muhl. ex Elliott | Poaceae | 8 |
| Aristida longespica | Poir. | Poaceae | 8 |
| Aristida oligantha | Michx. | Poaceae | 8 |
| Aristida palustris | (Chapm.) Vasey | Poaceae | 8 |
| Aristida purpurascens | Poir. | Poaceae | 8 |
| Aristida spiciformis | Elliott | Poaceae | 8 |
| Aristida stricta | Michx. | Poaceae | 8 |
| Aristida tuberculosa | Nutt. | Poaceae | 8 |
| Aristida virgata | Trin. | Poaceae | 8 |
| Aristolochia pentandra | Jacq. | Aristolochiaceae | 8 |
| Aristolochia serpentaria | L. | Aristolochiaceae | 8 |
| Aristolochia tomentosa | Sims | Aristolochiaceae | 8 |
| Arnica acaulis | (Walter) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Arnoglossum album | L.C.Anderson | Asteraceae | 8 |
| Arnoglossum atriplicifolium | (L.) H.Rob. | Asteraceae | 8 |
| Arnoglossum floridanum | (A.Gray) H.Rob. | Asteraceae | 8 |
| Arnoglossum ovatum | (Walter) H.Rob. | Asteraceae | 8 |
| Arnoglossum sulcatum | (Fernald) H.Rob. | Asteraceae | 8 |
| Aronia arbutifolia | (L.) Pers. | Rosaceae | 8 |
| Aronia melanocarpa | (Michx.) Elliott | Rosaceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia stelleriana | Besser | Asteraceae | 8 |
| Arundinaria gigantea | (Walter) Muhl. | Poaceae | 8 |
| Arundinaria tecta | (Walter) Muhl. | Poaceae | 8 |
| Asarum arifolium | Michx. | Aristolochiaceae | 8 |
| Asclepias amplexicaulis | Sm. | Apocynaceae | 8 |
| Asclepias cinerea | Walter | Apocynaceae | 8 |
| Asclepias connivens | Baldwin ex Elliott | Apocynaceae | 8 |
| Asclepias curtissii | A.Gray | Apocynaceae | 8 |
| Asclepias feayi | Chapm. ex A.Gray | Apocynaceae | 8 |
| Asclepias humistrata | Walter | Apocynaceae | 8 |
| Asclepias incarnata | L. | Apocynaceae | 8 |
| Asclepias lanceolata | Walter | Apocynaceae | 8 |
| Asclepias longifolia | Michx. | Apocynaceae | 8 |
| Asclepias michauxii | Decne. | Apocynaceae | 8 |
| Asclepias obovata | Elliott | Apocynaceae | 8 |
| Asclepias pedicellata | Walter | Apocynaceae | 8 |
| Asclepias perennis | Walter | Apocynaceae | 8 |
| Asclepias rubra | L. | Apocynaceae | 8 |
| Asclepias tomentosa | Elliott | Apocynaceae | 8 |
| Asclepias tuberosa | L. | Apocynaceae | 8 |
| Asclepias variegata | L. | Apocynaceae | 8 |
| Asclepias verticillata | L. | Apocynaceae | 8 |
| Asclepias viridiflora | Raf. | Apocynaceae | 8 |
| Asclepias viridis | Walter | Apocynaceae | 8 |
| Asclepias viridula | Chapm. | Apocynaceae | 8 |
| Asemeia grandiflora | (Walter) Small | Polygalaceae | 8 |
| Asimina angustifolia | Raf. | Annonaceae | 8 |
| Asimina incana | (W.Bartram) Exell | Annonaceae | 8 |
| Asimina obovata | (Willd.) Nash | Annonaceae | 8 |
| Asimina parviflora | (Michx.) Dunal | Annonaceae | 8 |
| Asimina pulchella | (Small) Rehder & Dayton | Annonaceae | 8 |
| Asimina pygmaea | (W.Bartram) Dunal | Annonaceae | 8 |
| Asimina reticulata | Shuttlew. ex Chapm. | Annonaceae | 8 |
| Asimina rugelii | B.L.Rob. | Annonaceae | 8 |
| Asimina tetramera | Small | Annonaceae | 8 |
| Asimina triloba | (L.) Dunal | Annonaceae | 8 |
| Asplenium monanthes | L. | Aspleniaceae | 8 |
| Asplenium platyneuron | (L.) Britton, Sterns & Poggenb. | Aspleniaceae | 8 |
| Asplenium resiliens | Kunze | Aspleniaceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Aster subulatus | Michx. | Asteraceae | 8 |
| Astragalus obcordatus | Elliott | Fabaceae | 8 |
| Athyrium asplenioides | (Michx.) Desv. | Athyriaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Aureolaria flava | (L.) Farw. | Orobanchaceae | 8 |
| Aureolaria pectinata | (Nutt.) Pennell | Orobanchaceae | 8 |
| Aureolaria virginica | (L.) Pennell | Orobanchaceae | 8 |
| Avenella flexuosa | (L.) Drejer | Poaceae | 8 |
| Avicennia germinans | (L.) L. | Acanthaceae | 8 |
| Axonopus compressus | (Sw.) P.Beauv. | Poaceae | 8 |
| Axonopus fissifolius | (Raddi) Kuhlm. | Poaceae | 8 |
| Axonopus furcatus | (Flüggé) Hitchc. | Poaceae | 8 |
| Azolla caroliniana | Willd. | Salviniaceae | 8 |
| Baccharis angustifolia | Michx. | Asteraceae | 8 |
| Baccharis glomeruliflora | Pers. | Asteraceae | 8 |
| Baccharis halimifolia | L. | Asteraceae | 8 |
| Bacopa caroliniana | (Walter) B.L.Rob. | Plantaginaceae | 8 |
| Bacopa monnieri | (L.) Wettst. | Plantaginaceae | 8 |
| Balduina angustifolia | B.L.Rob. | Asteraceae | 8 |
| Balduina uniflora | Nutt. | Asteraceae | 8 |
| Baptisia alba | (L.) R.Br. | Fabaceae | 8 |
| Baptisia lactea | (Raf.) Thieret | Fabaceae | 8 |
| Baptisia lanceolata | (Walter) Elliott | Fabaceae | 8 |
| Baptisia lecontei | Torr. & A.Gray | Fabaceae | 8 |
| Baptisia megacarpa | Chapm. ex Torr. & A.Gray | Fabaceae | 8 |
| Baptisia perfoliata | (L.) R.Br. | Fabaceae | 8 |
| Baptisia simplicifolia | Croom | Fabaceae | 8 |
| Bartonia paniculata | (Michx.) Muhl. | Gentianaceae | 8 |
| Bartonia verna | (Michx.) Raf. ex Barton | Gentianaceae | 8 |
| Bartonia virginica | (L.) Britton, Sterns & Poggenb. | Gentianaceae | 8 |
| Batis maritima | L. | Bataceae | 8 |
| Bejaria racemosa | Vent. | Ericaceae | 8 |
| Beloglottis costaricensis | (Rchb.f.) Schltr. | Orchidaceae | 8 |
| Berchemia scandens | (Hill) K.Koch | Rhamnaceae | 8 |
| Berlandiera pumila | (Michx.) Nutt. | Asteraceae | 8 |
| Berlandiera subacaulis | (Nutt.) Nutt. | Asteraceae | 8 |
| Betula nigra | L. | Betulaceae | 8 |
| Bidens alba | DC. | Asteraceae | 8 |
| Bidens bipinnata | L. | Asteraceae | 8 |
| Bidens discoidea | Britton | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens laevis | (L.) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Bidens mitis | Sherff | Asteraceae | 8 |
| Bidens trichosperma | (Michx.) Britton | Asteraceae | 8 |
| Bigelowia australis | (L.C.Anderson) G.L.Nesom | Asteraceae | 8 |
| Bigelowia nudata | (Michx.) DC. | Asteraceae | 8 |
| Bigelowia nuttallii | L.C.Anderson | Asteraceae | 8 |
| Bignonia capreolata | L. | Bignoniaceae | 8 |
| Blechnum appendiculatum | Willd. | Blechnaceae | 8 |
| Bletia purpurea | (Lam.) A.DC. | Orchidaceae | 8 |
| Bletia spicata | (Walter) Sosa & M.W.Chase | Orchidaceae | 8 |
| Boehmeria cylindrica | (L.) Sw. | Urticaceae | 8 |
| Boerhavia coccinea | Mill. | Nyctaginaceae | 8 |
| Boerhavia diffusa | L. | Nyctaginaceae | 8 |
| Boerhavia erecta | L. | Nyctaginaceae | 8 |
| Bolboschoenus robustus | (Pursh) Soják | Cyperaceae | 8 |
| Boltonia asteroides | L'Hér. | Asteraceae | 8 |
| Boltonia diffusa | Elliott | Asteraceae | 8 |
| Bonamia grandiflora | (A.Gray) Hallier f. | Convolvulaceae | 8 |
| Borodinia canadensis | (L.) P.J.Alexander & Windham | Brassicaceae | 8 |
| Borrichia arborescens | (L.) DC. | Asteraceae | 8 |
| Borrichia frutescens | (L.) DC. | Asteraceae | 8 |
| Bothriochloa barbinodis | (Lag.) Herter | Poaceae | 8 |
| Bothriochloa torreyana | (Steud.) Scrivanti & Anton | Poaceae | 8 |
| Botrypus virginianus | (L.) Michx. | Ophioglossaceae | 8 |
| Bourreria succulenta | Jacq. | Ehretiaceae | 8 |
| Bouteloua curtipendula | (Michx.) Torr. | Poaceae | 8 |
| Bouteloua hirsuta | Lag. | Poaceae | 8 |
| Brachyelytrum erectum | (Schreb.) P.Beauv. | Poaceae | 8 |
| Brasenia schreberi | J.F.Gmel. | Cabombaceae | 8 |
| Brickellia cordifolia | Elliott | Asteraceae | 8 |
| Brickellia eupatorioides | (L.) Shinners | Asteraceae | 8 |
| Bromus pubescens | Muhl. ex Willd. | Poaceae | 8 |
| Brunnichia ovata | (Walter) Shinners | Polygonaceae | 8 |
| Buchnera americana | L. | Orobanchaceae | 8 |
| Buchnera floridana | Gand. | Orobanchaceae | 8 |
| Buchnera pusilla | Kunth | Orobanchaceae | 8 |
| Bulbostylis capillaris | (L.) Kunth ex C.B.Clarke | Cyperaceae | 8 |
| Bulbostylis ciliatifolia | (Elliott) Fernald | Cyperaceae | 8 |
| Bulbostylis stenophylla | (Elliott) C.B.Clarke | Cyperaceae | 8 |
| Bulbostylis warei | (Torr.) C.B.Clarke | Cyperaceae | 8 |
| Burmannia biflora | L. | Burmanniaceae | 8 |
| Burmannia capitata | (Walter ex J.F.Gmel.) Mart. | Burmanniaceae | 8 |
| Bursera simaruba | (L.) Sarg. | Burseraceae | 8 |
| Byrsonima lucida | (Mill.) DC. | Malpighiaceae | 8 |
| Cabomba caroliniana | A.Gray | Cabombaceae | 8 |
| Cakile constricta | Rodman | Brassicaceae | 8 |
| Cakile edentula | (Bigelow) Hook. | Brassicaceae | 8 |
| Callicarpa americana | L. | Lamiaceae | 8 |
| Callirhoe papaver | (Cav.) A.Gray | Malvaceae | 8 |
| Callirhoe triangulata | (Leavenw.) A.Gray | Malvaceae | 8 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Calopogon barbatus | (Walter) Ames | Orchidaceae | 8 |
| Calopogon multiflorus | Lindl. | Orchidaceae | 8 |
| Calopogon pallidus | Chapm. | Orchidaceae | 8 |
| Calopogon tuberosus | (L.) Britton, Sterns & Poggenb. | Orchidaceae | 8 |
| Calycanthus floridus | L. | Calycanthaceae | 8 |
| Calycocarpum lyonii | (Pursh) Nutt. ex A.Gray | Menispermaceae | 8 |
| Calyptocarpus vialis | Less. | Asteraceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Campanula americana | L. | Campanulaceae | 8 |
| Campsis radicans | (L.) Bureau | Bignoniaceae | 8 |
| Campyloneurum angustifolium | (Sw.) Fée | Polypodiaceae | 8 |
| Campyloneurum phyllitidis | (L.) C.Presl | Polypodiaceae | 8 |
| Canavalia rosea | (Sw.) DC. | Fabaceae | 8 |
| Canella winterana | (L.) Gaertn. | Canellaceae | 8 |
| Canna flaccida | Salisb. | Cannaceae | 8 |
| Canna glauca | L. | Cannaceae | 8 |
| Canna indica | L. | Cannaceae | 8 |
| Cantinoa mutabilis | (Rich.) Harley & J.F.B.Pastore | Lamiaceae | 8 |
| Capsicum annuum | L. | Solanaceae | 8 |
| Cardamine bulbosa | (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | Brassicaceae | 8 |
| Cardamine clematitis | Shuttlew. ex S.Watson | Brassicaceae | 8 |
| Cardamine concatenata | (Michx.) O.Schwarz | Brassicaceae | 8 |
| Cardamine parviflora | L. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Carex abscondita | Mack. | Cyperaceae | 8 |
| Carex albicans | Willd. ex Spreng. | Cyperaceae | 8 |
| Carex atlantica | L.H.Bailey | Cyperaceae | 8 |
| Carex aureolensis | Steud. | Cyperaceae | 8 |
| Carex basiantha | Steud. | Cyperaceae | 8 |
| Carex blanda | Dewey | Cyperaceae | 8 |
| Carex bromoides | Willd. | Cyperaceae | 8 |
| Carex cephalophora | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex cherokeensis | Schwein. | Cyperaceae | 8 |
| Carex complanata | Torr. & Hook. | Cyperaceae | 8 |
| Carex corrugata | Fernald | Cyperaceae | 8 |
| Carex crebriflora | Wiegand | Cyperaceae | 8 |
| Carex crus-corvi | Shuttlew. ex Kunze | Cyperaceae | 8 |
| Carex dasycarpa | Muhl. | Cyperaceae | 8 |
| Carex debilis | Michx. | Cyperaceae | 8 |
| Carex decomposita | Muhl. | Cyperaceae | 8 |
| Carex digitalis | Willd. | Cyperaceae | 8 |
| Carex elliottii | Schwein. & Torr. | Cyperaceae | 8 |
| Carex flaccosperma | Dewey | Cyperaceae | 8 |
| Carex gigantea | Rudge | Cyperaceae | 8 |
| Carex glaucescens | Elliott | Cyperaceae | 8 |
| Carex gracilescens | Steud. | Cyperaceae | 8 |
| Carex granularis | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex grayi | J.Carey | Cyperaceae | 8 |
| Carex hyalinolepis | Steud. | Cyperaceae | 8 |
| Carex ignota | Dewey | Cyperaceae | 8 |
| Carex intumescens | Rudge | Cyperaceae | 8 |
| Carex joorii | L.H.Bailey | Cyperaceae | 8 |
| Carex kraliana | Naczi & Bryson | Cyperaceae | 8 |
| Carex laevivaginata | (Kük.) Mack. | Cyperaceae | 8 |
| Carex leavenworthii | Dewey | Cyperaceae | 8 |
| Carex leptalea | Wahlenb. | Cyperaceae | 8 |
| Carex lonchocarpa | Willd. ex Spreng. | Cyperaceae | 8 |
| Carex longii | Mack. | Cyperaceae | 8 |
| Carex louisianica | L.H.Bailey | Cyperaceae | 8 |
| Carex lupulina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex lurida | Wahlenb. | Cyperaceae | 8 |
| Carex lutea | LeBlond | Cyperaceae | 8 |
| Carex microdonta | Torr. | Cyperaceae | 8 |
| Carex muehlenbergii | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex oxylepis | Torr. & Hook. | Cyperaceae | 8 |
| Carex pigra | Naczi | Cyperaceae | 8 |
| Carex retroflexa | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex rosea | Willd. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex striata | Michx. | Cyperaceae | 8 |
| Carex striatula | Michx. | Cyperaceae | 8 |
| Carex styloflexa | Buckley | Cyperaceae | 8 |
| Carex tenax | Chapm. ex Dewey | Cyperaceae | 8 |
| Carex texensis | (Torr. ex L.H.Bailey) L.H.Bailey | Cyperaceae | 8 |
| Carex tribuloides | Wahlenb. | Cyperaceae | 8 |
| Carex turgescens | Torr. | Cyperaceae | 8 |
| Carex venusta | Dewey | Cyperaceae | 8 |
| Carex verrucosa | Muhl. | Cyperaceae | 8 |
| Carex vexans | F.J.Herm. | Cyperaceae | 8 |
| Carex vulpinoidea | Michx. | Cyperaceae | 8 |
| Carphephorus corymbosus | (Nutt.) Torr. & A.Gray | Asteraceae | 8 |
| Carphephorus odoratissimus | (J.F.Gmel.) H.J.-C.Hebert | Asteraceae | 8 |
| Carphephorus pseudoliatris | Cass. | Asteraceae | 8 |
| Carpinus caroliniana | Walter | Betulaceae | 8 |
| Carya aquatica | (F.Michx.) Nutt. ex Elliott | Juglandaceae | 8 |
| Carya cordiformis | (Wangenh.) K.Koch | Juglandaceae | 8 |
| Carya floridana | Sarg. | Juglandaceae | 8 |
| Carya glabra | (Mill.) Sweet | Juglandaceae | 8 |
| Carya pallida | (Ashe) Engelm. & Graebn. | Juglandaceae | 8 |
| Carya tomentosa | (Lam.) Nutt. | Juglandaceae | 8 |
| Casasia clusiifolia | (Jacq.) Urb. | Rubiaceae | 8 |
| Cassytha filiformis | L. | Lauraceae | 8 |
| Castanea dentata | Borkh. | Fagaceae | 8 |
| Castanea pumila | (L.) Mill. | Fagaceae | 8 |
| Castilleja coccinea | (L.) Spreng. | Orobanchaceae | 8 |
| Castilleja indivisa | Engelm. | Orobanchaceae | 8 |
| Catalpa bignonioides | Walter | Bignoniaceae | 8 |
| Catopsis berteroniana | (Schult. & Schult.f.) Mez | Bromeliaceae | 8 |
| Catopsis floribunda | L.B.Sm. | Bromeliaceae | 8 |
| Catopsis nutans | (Sw.) Griseb. | Bromeliaceae | 8 |
| Cayaponia quinqueloba | (Raf.) Shinners | Cucurbitaceae | 8 |
| Ceanothus americanus | L. | Rhamnaceae | 8 |
| Ceanothus microphyllus | Michx. | Rhamnaceae | 8 |
| Celosia nitida | Vahl | Amaranthaceae | 8 |
| Celtis iguanaea | (Jacq.) Sarg. | Cannabaceae | 8 |
| Celtis laevigata | Willd. | Cannabaceae | 8 |
| Celtis pallida | Torr. | Cannabaceae | 8 |
| Celtis tenuifolia | Nutt. | Cannabaceae | 8 |
| Cenchrus echinatus | L. | Poaceae | 8 |
| Cenchrus gracillimus | Nash | Poaceae | 8 |
| Cenchrus myosuroides | Kunth | Poaceae | 8 |
| Cenchrus spinifex | Cav. | Poaceae | 8 |
| Cenchrus tribuloides | L. | Poaceae | 8 |
| Centella erecta | (L.f.) Fernald | Apiaceae | 8 |
| Centrosema arenicola | (Small) F.J.Herm. | Fabaceae | 8 |
| Centrosema virginianum | (L.) Benth. | Fabaceae | 8 |
| Cephalanthus occidentalis | L. | Rubiaceae | 8 |
| Ceratiola ericoides | Michx. | Ericaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Ceratophyllum echinatum | A.Gray | Ceratophyllaceae | 8 |
| Cercis canadensis | L. | Fabaceae | 8 |
| Chaerophyllum tainturieri | Hook. | Apiaceae | 8 |
| Chamaecrista fasciculata | (Michx.) Greene | Fabaceae | 8 |
| Chamaecrista nictitans | (L.) Moench | Fabaceae | 8 |
| Chamaecyparis thyoides | (L.) Britton, Sterns & Poggenb. | Cupressaceae | 8 |
| Chamaelirium luteum | (L.) A.Gray | Melanthiaceae | 8 |
| Chapmannia floridana | Torr. & A.Gray | Fabaceae | 8 |
| Chaptalia tomentosa | Vent. | Asteraceae | 8 |
| Chasmanthium latifolium | (Michx.) H.O.Yates | Poaceae | 8 |
| Chasmanthium laxum | (L.) H.O.Yates | Poaceae | 8 |
| Chasmanthium nitidum | (Baldwin ex Elliott) H.O.Yates | Poaceae | 8 |
| Cheiroglossa palmata | (L.) C.Presl | Ophioglossaceae | 8 |
| Chenopodium album | L. | Chenopodiaceae | 8 |
| Chenopodium berlandieri | Moq. | Chenopodiaceae | 8 |
| Chimaphila maculata | (L.) Pursh | Ericaceae | 8 |
| Chiococca alba | (L.) Hitchc. | Rubiaceae | 8 |
| Chionanthus pygmaeus | Small | Oleaceae | 8 |
| Chionanthus virginicus | L. | Oleaceae | 8 |
| Chloris cucullata | Bisch. | Poaceae | 8 |
| Chloris virgata | Sw. | Poaceae | 8 |
| Chromolaena odorata | (L.) R.M.King & H.Rob. | Asteraceae | 8 |
| Chrysobalanus icaco | L. | Chrysobalanaceae | 8 |
| Chrysogonum virginianum | L. | Asteraceae | 8 |
| Chrysoma pauciflosculosa | Greene | Asteraceae | 8 |
| Chrysophyllum oliviforme | L. | Sapotaceae | 8 |
| Chrysopogon pauciflorus | (Chapm.) Benth. ex Vasey | Poaceae | 8 |
| Chrysopsis floridana | Small | Asteraceae | 8 |
| Chrysopsis godfreyi | Semple | Asteraceae | 8 |
| Chrysopsis gossypina | (Michx.) Elliott | Asteraceae | 8 |
| Chrysopsis highlandsensis | DeLaney & Wunderlin | Asteraceae | 8 |
| Chrysopsis latisquamea | Pollard | Asteraceae | 8 |
| Chrysopsis mariana | Elliott | Asteraceae | 8 |
| Chrysopsis scabrella | Torr. & A.Gray | Asteraceae | 8 |
| Chrysopsis subulata | Small | Asteraceae | 8 |
| Chthamalia pubiflora | Decne. | Apocynaceae | 8 |
| Cicuta bulbifera | L. | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cirsium altissimum | (L.) Hill | Asteraceae | 8 |
| Cirsium horridulum | Michx. | Asteraceae | 8 |
| Cirsium lecontei | Torr. & A.Gray | Asteraceae | 8 |
| Cirsium muticum | Michx. | Asteraceae | 8 |
| Cirsium virginianum | Michx. | Asteraceae | 8 |
| Cissampelos pareira | L. | Menispermaceae | 8 |
| Cissus trifoliata | (L.) L. | Vitaceae | 8 |
| Cissus verticillata | (L.) Nicolson & C.E.Jarvis | Vitaceae | 8 |
| Cladium mariscoides | (Muhl.) Torr. | Cyperaceae | 8 |
| Cladium mariscus | (L.) Pohl | Cyperaceae | 8 |
| Cleistesiopsis bifaria | (Fernald) Pansarin & F.Barros | Orchidaceae | 8 |
| Cleistesiopsis divaricata | (L.) Pansarin & F.Barros | Orchidaceae | 8 |
| Cleistesiopsis oricamporum | P.M.Br. | Orchidaceae | 8 |
| Clematis baldwinii | Torr. & A.Gray | Ranunculaceae | 8 |
| Clematis catesbyana | Pursh | Ranunculaceae | 8 |
| Clematis crispa | L. | Ranunculaceae | 8 |
| Clematis glaucophylla | Small | Ranunculaceae | 8 |
| Clematis reticulata | Walter | Ranunculaceae | 8 |
| Clematis virginiana | L. | Ranunculaceae | 8 |
| Cleome aldenella | W.R.Ernst | Cleomaceae | 8 |
| Clethra alnifolia | L. | Clethraceae | 8 |
| Clethra tomentosa | Lam. | Clethraceae | 8 |
| Cliftonia monophylla | (Lam.) Britton | Cyrillaceae | 8 |
| Clinopodium ashei | (Weath.) Small | Lamiaceae | 8 |
| Clinopodium brownei | (Sw.) Kuntze | Lamiaceae | 8 |
| Clinopodium carolinianum | Mill. | Lamiaceae | 8 |
| Clinopodium coccineum | (Nutt. ex Hook.) Kuntze | Lamiaceae | 8 |
| Clinopodium dentatum | (Chapm.) Kuntze | Lamiaceae | 8 |
| Clitoria fragrans | Small | Fabaceae | 8 |
| Clitoria mariana | L. | Fabaceae | 8 |
| Clusia rosea | Jacq. | Clusiaceae | 8 |
| Cnidoscolus stimulosus | (Michx.) Engelm. & A.Gray | Euphorbiaceae | 8 |
| Coccoloba diversifolia | Jacq. | Polygonaceae | 8 |
| Coccoloba uvifera | (L.) L. | Polygonaceae | 8 |
| Coccothrinax argentata | (Jacq.) L.H.Bailey | Arecaceae | 8 |
| Coleataenia abscissa | (Swallen) LeBlond | Poaceae | 8 |
| Coleataenia anceps | (Michx.) Soreng | Poaceae | 8 |
| Coleataenia longifolia | (Torr.) Soreng | Poaceae | 8 |
| Coleataenia rigidula | (Bosc ex Nees) LeBlond | Poaceae | 8 |
| Coleataenia tenera | (Beyr. ex Trin.) Soreng | Poaceae | 8 |
| Collinsonia anisata | Sims | Lamiaceae | 8 |
| Collinsonia canadensis | L. | Lamiaceae | 8 |
| Collinsonia punctata | Elliott | Lamiaceae | 8 |
| Colubrina arborescens | (Mill.) Sarg. | Rhamnaceae | 8 |
| Commelina erecta | L. | Commelinaceae | 8 |
| Commelina virginica | L. | Commelinaceae | 8 |
| Condea verticillata | (Jacq.) Harley & J.F.B.Pastore | Lamiaceae | 8 |
| Conocarpus erectus | L. | Combretaceae | 8 |
| Conoclinium coelestinum | DC. | Asteraceae | 8 |
| Conopholis americana | (L.) Wallr. | Orobanchaceae | 8 |
| Conradina canescens | A.Gray | Lamiaceae | 8 |
| Conradina grandiflora | Small | Lamiaceae | 8 |
| Corallorhiza odontorhiza | (Willd.) Nutt. | Orchidaceae | 8 |
| Corallorhiza wisteriana | Conrad | Orchidaceae | 8 |
| Corchorus siliquosus | L. | Malvaceae | 8 |
| Coreopsis auriculata | L. | Asteraceae | 8 |
| Coreopsis basalis | (A.Dietr.) S.F.Blake | Asteraceae | 8 |
| Coreopsis grandiflora | Hogg ex Sweet | Asteraceae | 8 |
| Coreopsis lanceolata | L. | Asteraceae | 8 |
| Coreopsis leavenworthii | Torr. & A.Gray | Asteraceae | 8 |
| Coreopsis nudata | Nutt. | Asteraceae | 8 |
| Coreopsis nuecensis | A.Heller | Asteraceae | 8 |
| Coreopsis pubescens | Elliott | Asteraceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Coreopsis tripteris | L. | Asteraceae | 8 |
| Cornus alternifolia | L.f. | Cornaceae | 8 |
| Cornus amomum | Mill. | Cornaceae | 8 |
| Cornus asperifolia | Michx. | Cornaceae | 8 |
| Cornus florida | L. | Cornaceae | 8 |
| Cornus foemina | Mill. | Cornaceae | 8 |
| Corydalis flavula | (Raf.) DC. | Papaveraceae | 8 |
| Corydalis micrantha | (Engelm. ex A.Gray) A.Gray ex J.M.Coult. | Papaveraceae | 8 |
| Crataegus berberifolia | Torr. & A.Gray | Rosaceae | 8 |
| Crataegus crus-galli | L. | Rosaceae | 8 |
| Crataegus munda | Beadle | Rosaceae | 8 |
| Crataegus phaenopyrum | (L.f.) Medik. | Rosaceae | 8 |
| Crataegus spathulata | Michx. | Rosaceae | 8 |
| Crataegus uniflora | Münchh. | Rosaceae | 8 |
| Crataegus viridis | L. | Rosaceae | 8 |
| Crinum americanum | L. | Amaryllidaceae | 8 |
| Crocanthemum arenicola | (Chapm.) Barnhart | Cistaceae | 8 |
| Crocanthemum carolinianum | (Walter) Spach | Cistaceae | 8 |
| Crocanthemum corymbosum | (Michx.) Britton | Cistaceae | 8 |
| Crocanthemum georgianum | (Chapm.) Barnhart | Cistaceae | 8 |
| Crocanthemum nashii | (Britton) Barnhart | Cistaceae | 8 |
| Crocanthemum rosmarinifolium | (Pursh) Janch. | Cistaceae | 8 |
| Croomia pauciflora | (Nutt.) Torr. | Stemonaceae | 8 |
| Croptilon divaricatum | (Nutt.) Raf. | Asteraceae | 8 |
| Crossopetalum rhacoma | Crantz | Celastraceae | 8 |
| Crotalaria avonensis | DeLaney & Wunderlin | Fabaceae | 8 |
| Crotalaria pumila | Ortega | Fabaceae | 8 |
| Crotalaria purshii | DC. | Fabaceae | 8 |
| Crotalaria rotundifolia | J.F.Gmel. | Fabaceae | 8 |
| Croton argyranthemus | Michx. | Euphorbiaceae | 8 |
| Croton glandulosus | L. | Euphorbiaceae | 8 |
| Croton humilis | L. | Euphorbiaceae | 8 |
| Croton lindheimeri | (Engelm. & A.Gray) Alph.Wood | Euphorbiaceae | 8 |
| Croton linearis | Jacq. | Euphorbiaceae | 8 |
| Croton michauxii | G.L.Webster | Euphorbiaceae | 8 |
| Croton punctatus | Jacq. | Euphorbiaceae | 8 |
| Croton texensis | (Klotzsch) Müll.Arg. | Euphorbiaceae | 8 |
| Cryptotaenia canadensis | (L.) DC. | Apiaceae | 8 |
| Ctenium aromaticum | (Walter) Alph.Wood | Poaceae | 8 |
| Ctenodon viscidulus | (Michx.) D.B.O.S.Cardoso & A.Delgado | Fabaceae | 8 |
| Cunila origanoides | (L.) Britton | Lamiaceae | 8 |
| Cupania glabra | Sw. | Sapindaceae | 8 |
| Cuphea viscosissima | Jacq. | Lythraceae | 8 |
| Cuscuta campestris | Yunck. | Convolvulaceae | 8 |
| Cuscuta compacta | Juss. ex Choisy | Convolvulaceae | 8 |
| Cuscuta exaltata | Engelm. | Convolvulaceae | 8 |
| Cuscuta gronovii | Willd. | Convolvulaceae | 8 |
| Cuscuta indecora | Choisy | Convolvulaceae | 8 |
| Cuscuta pentagona | Engelm. | Convolvulaceae | 8 |
| Cuscuta umbellata | Kunth | Convolvulaceae | 8 |
| Cuthbertia graminea | Small | Commelinaceae | 8 |
| Cuthbertia ornata | Small | Commelinaceae | 8 |
| Cuthbertia rosea | (Vent.) Small | Commelinaceae | 8 |
| Cyclopogon cranichoides | (Griseb.) Schltr. | Orchidaceae | 8 |
| Cyclopogon elatus | (Sw.) Schltr. | Orchidaceae | 8 |
| Cyclosorus interruptus | (Willd.) H.Itô | Thelypteridaceae | 8 |
| Cynanchum laeve | (Michx.) Pers. | Apocynaceae | 8 |
| Cyperus articulatus | L. | Cyperaceae | 8 |
| Cyperus bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus blepharoleptos | Steud. | Cyperaceae | 8 |
| Cyperus brevifolius | (Rottb.) Hassk. | Cyperaceae | 8 |
| Cyperus compressus | L. | Cyperaceae | 8 |
| Cyperus croceus | Vahl | Cyperaceae | 8 |
| Cyperus cuspidatus | Kunth | Cyperaceae | 8 |
| Cyperus distans | L.f. | Cyperaceae | 8 |
| Cyperus distinctus | Steud. | Cyperaceae | 8 |
| Cyperus echinatus | (L.) Alph.Wood | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus filiculmis | Vahl | Cyperaceae | 8 |
| Cyperus flavescens | L. | Cyperaceae | 8 |
| Cyperus grayi | Torr. | Cyperaceae | 8 |
| Cyperus haspan | L. | Cyperaceae | 8 |
| Cyperus lanceolatus | Poir. | Cyperaceae | 8 |
| Cyperus lecontei | Torr. ex Steud. | Cyperaceae | 8 |
| Cyperus ligularis | L. | Cyperaceae | 8 |
| Cyperus ochraceus | Vahl | Cyperaceae | 8 |
| Cyperus odoratus | L. | Cyperaceae | 8 |
| Cyperus ovatus | Baldwin | Cyperaceae | 8 |
| Cyperus pedunculatus | (R.Br.) J.Kern | Cyperaceae | 8 |
| Cyperus planifolius | Rich. | Cyperaceae | 8 |
| Cyperus plukenetii | Fernald | Cyperaceae | 8 |
| Cyperus polystachyos | Rottb. | Cyperaceae | 8 |
| Cyperus pseudovegetus | Steud. | Cyperaceae | 8 |
| Cyperus retrorsus | Chapm. | Cyperaceae | 8 |
| Cyperus sesquiflorus | (Torr.) Mattf. & Kük. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cyperus strigosus | L. | Cyperaceae | 8 |
| Cyperus subsquarrosus | (Muhl.) Bauters | Cyperaceae | 8 |
| Cyperus surinamensis | Rottb. | Cyperaceae | 8 |
| Cyperus tetragonus | Elliott | Cyperaceae | 8 |
| Cyperus thyrsiflorus | Jungh. | Cyperaceae | 8 |
| Cyperus virens | Michx. | Cyperaceae | 8 |
| Cyrilla racemiflora | L. | Cyrillaceae | 8 |
| Cystopteris protrusa | (Weath.) Blasdell | Cystopteridaceae | 8 |
| Dalbergia ecastaphyllum | (L.) Taub. | Fabaceae | 8 |
| Dalea carnea | (Michx.) Poir. | Fabaceae | 8 |
| Dalea feayi | (Chapm.) Barneby | Fabaceae | 8 |
| Dalea mountjoyae | M.Woods | Fabaceae | 8 |
| Dalea pinnata | (J.F.Gmel.) Barneby | Fabaceae | 8 |
| Damburneya coriacea | (Sw.) Trofimov & Rohwer | Lauraceae | 8 |
| Danthonia spicata | (L.) Roem. & Schult. | Poaceae | 8 |
| Daucus pusillus | Michx. | Apiaceae | 8 |
| Decodon verticillatus | (L.) Elliott | Lythraceae | 8 |
| Delphinium carolinianum | Walter | Ranunculaceae | 8 |
| Dendrophylax porrectus | (Rchb.f.) Carlsward & Whitten | Orchidaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Desmanthus illinoensis | (Michx.) MacMill. ex B.L.Rob. & Fernald | Fabaceae | 8 |
| Desmanthus virgatus | (L.) Willd. | Fabaceae | 8 |
| Desmodium canescens | (L.) DC. | Fabaceae | 8 |
| Desmodium ciliare | (Muhl. ex Willd.) DC. | Fabaceae | 8 |
| Desmodium cuspidatum | (Muhl. ex Willd.) DC. ex G.Don | Fabaceae | 8 |
| Desmodium fernaldii | B.G.Schub. | Fabaceae | 8 |
| Desmodium floridanum | Chapm. | Fabaceae | 8 |
| Desmodium glabellum | (Michx.) DC. | Fabaceae | 8 |
| Desmodium laevigatum | (Nutt.) DC. | Fabaceae | 8 |
| Desmodium lineatum | DC. | Fabaceae | 8 |
| Desmodium marilandicum | (L.) DC. | Fabaceae | 8 |
| Desmodium nuttallii | (Schindl.) B.G.Schub. | Fabaceae | 8 |
| Desmodium obtusum | (Muhl. ex Willd.) DC. | Fabaceae | 8 |
| Desmodium ochroleucum | M.A.Curtis ex Canby | Fabaceae | 8 |
| Desmodium paniculatum | (L.) DC. | Fabaceae | 8 |
| Desmodium rotundifolium | DC. | Fabaceae | 8 |
| Desmodium scorpiurus | (Sw.) Poir. | Fabaceae | 8 |
| Desmodium sessilifolium | (Torr. ex M.A.Curtis) Torr. & A.Gray | Fabaceae | 8 |
| Desmodium tenuifolium | Torr. & A.Gray | Fabaceae | 8 |
| Desmodium viridiflorum | (L.) DC. | Fabaceae | 8 |
| Dianthera americana | L. | Acanthaceae | 8 |
| Dianthera angusta | (Chapm.) Small | Acanthaceae | 8 |
| Dianthera crassifolia | Chapm. | Acanthaceae | 8 |
| Dianthera ovata | Walter | Acanthaceae | 8 |
| Dicerandra densiflora | Benth. | Lamiaceae | 8 |
| Dicerandra linearifolia | (Elliott) Benth. | Lamiaceae | 8 |
| Dichanthelium aciculare | (Desv.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium acuminatum | (Sw.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium boscii | (Poir.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium breve | (Hitchc. & Chase) LeBlond | Poaceae | 8 |
| Dichanthelium caerulescens | (Hack. ex Hitchc.) Correll | Poaceae | 8 |
| Dichanthelium chamaelonche | (Trin.) Freckmann & Lelong | Poaceae | 8 |
| Dichanthelium clandestinum | (L.) Gould | Poaceae | 8 |
| Dichanthelium commonsianum | (Ashe) Freckmann | Poaceae | 8 |
| Dichanthelium commutatum | (Schult.) Gould | Poaceae | 8 |
| Dichanthelium consanguineum | (Kunth) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium curtifolium | (Nash) LeBlond | Poaceae | 8 |
| Dichanthelium dichotomum | (L.) Gould | Poaceae | 8 |
| Dichanthelium ensifolium | (Baldwin ex Elliott) Gould | Poaceae | 8 |
| Dichanthelium erectifolium | (Nash) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium filiramum | (Ashe) LeBlond | Poaceae | 8 |
| Dichanthelium glabrifolium | (Nash) LeBlond | Poaceae | 8 |
| Dichanthelium laxiflorum | (Lam.) Gould | Poaceae | 8 |
| Dichanthelium leucothrix | (Nash) Freckmann | Poaceae | 8 |
| Dichanthelium lindheimeri | (Nash) Gould | Poaceae | 8 |
| Dichanthelium linearifolium | (Scribn.) Gould | Poaceae | 8 |
| Dichanthelium longiligulatum | (Nash) Freckmann | Poaceae | 8 |
| Dichanthelium lucidum | (Ashe) LeBlond | Poaceae | 8 |
| Dichanthelium mattamuskeetense | (Ashe) Mohlenbr. | Poaceae | 8 |
| Dichanthelium microcarpon | (Muhl. ex Elliott) Mohlenbr. | Poaceae | 8 |
| Dichanthelium neuranthum | (Griseb.) LeBlond | Poaceae | 8 |
| Dichanthelium oligosanthes | (Schult.) Gould | Poaceae | 8 |
| Dichanthelium ovale | (Elliott) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium patentifolium | (Nash) Wipff | Poaceae | 8 |
| Dichanthelium pinetorum | (Swallen) LeBlond | Poaceae | 8 |
| Dichanthelium portoricense | (Desv.) B.F.Hansen & Wunderlin | Poaceae | 8 |
| Dichanthelium ravenelii | (Scribn. & Merr.) Gould | Poaceae | 8 |
| Dichanthelium roanokense | (Ashe) LeBlond | Poaceae | 8 |
| Dichanthelium scabriusculum | (Elliott) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium scoparium | (Lam.) Gould | Poaceae | 8 |
| Dichanthelium sphaerocarpon | (Elliott) Gould | Poaceae | 8 |
| Dichanthelium tenue | (Muhl.) Freckmann & Lelong | Poaceae | 8 |
| Dichanthelium webberianum | (Nash) LeBlond | Poaceae | 8 |
| Dichondra carolinensis | Michx. | Convolvulaceae | 8 |
| Dicliptera brachiata | Spreng. | Acanthaceae | 8 |
| Dicliptera sexangularis | (L.) Juss. | Acanthaceae | 8 |
| Digitaria cognata | (Schult.) Pilg. | Poaceae | 8 |
| Digitaria filiformis | (L.) Koeler | Poaceae | 8 |
| Digitaria insularis | (L.) Mez ex Ekman | Poaceae | 8 |
| Diodia virginiana | L. | Rubiaceae | 8 |
| Dioscorea floridana | Bartlett | Dioscoreaceae | 8 |
| Dioscorea villosa | L. | Dioscoreaceae | 8 |
| Diospyros virginiana | L. | Ebenaceae | 8 |
| Diplachne fusca | (L.) P.Beauv. | Poaceae | 8 |
| Dirca palustris | L. | Thymelaeaceae | 8 |
| Disakisperma dubium | (Kunth) P.M.Peterson & N.Snow | Poaceae | 8 |
| Distichlis littoralis | (Engelm.) H.L.Bell & Columbus | Poaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Distimake dissectus | (Jacq.) A.R.Simões & Staples | Convolvulaceae | 8 |
| Distimake quinquefolius | (L.) A.R.Simões & Staples | Convolvulaceae | 8 |
| Ditaxis argothamnoides | (Bertero ex Spreng.) Radcl.-Sm. & Govaerts | Euphorbiaceae | 8 |
| Ditrysinia fruticosa | (W.Bartram) Govaerts & Frodin | Euphorbiaceae | 8 |
| Dodonaea viscosa | Jacq. | Sapindaceae | 8 |
| Doellingeria infirma | (Michx.) Greene | Asteraceae | 8 |
| Doellingeria sericocarpoides | Small | Asteraceae | 8 |
| Drosera brevifolia | Pursh | Droseraceae | 8 |
| Drosera capillaris | Poir. | Droseraceae | 8 |
| Drosera filiformis | Raf. | Droseraceae | 8 |
| Drosera intermedia | Hayne | Droseraceae | 8 |
| Dryopteris ludoviciana | (Kunze) Small | Dryopteridaceae | 8 |
| Drypetes diversifolia | Krug & Urb. | Putranjivaceae | 8 |
| Drypetes lateriflora | (Sw.) Krug & Urb. | Putranjivaceae | 8 |
| Dulichium arundinaceum | (L.) Britton | Cyperaceae | 8 |
| Duranta erecta | L. | Verbenaceae | 8 |
| Dyschoriste angusta | (A.Gray) Small | Acanthaceae | 8 |
| Dyschoriste oblongifolia | (Michx.) Kuntze | Acanthaceae | 8 |
| Dysphania ambrosioides | (L.) Mosyakin & Clemants | Chenopodiaceae | 8 |
| Echinacea purpurea | (L.) Moench | Asteraceae | 8 |
| Echinochloa muricata | (P.Beauv.) Fernald | Poaceae | 8 |
| Echinochloa walteri | (Pursh) A.Heller | Poaceae | 8 |
| Echinodorus berteroi | (Spreng.) Fassett | Alismataceae | 8 |
| Echites umbellatus | Jacq. | Apocynaceae | 8 |
| Eclipta prostrata | (L.) L. | Asteraceae | 8 |
| Edrastima uniflora | (L.) Raf. | Rubiaceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis atropurpurea | (Retz.) J.Presl & C.Presl | Cyperaceae | 8 |
| Eleocharis baldwinii | (Torr.) Chapm. | Cyperaceae | 8 |
| Eleocharis cellulosa | Torr. | Cyperaceae | 8 |
| Eleocharis elegans | (Kunth) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis elongata | Chapm. | Cyperaceae | 8 |
| Eleocharis equisetoides | (Elliott) Torr. | Cyperaceae | 8 |
| Eleocharis geniculata | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis interstincta | (Vahl) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis montana | (Kunth) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis montevidensis | Kunth | Cyperaceae | 8 |
| Eleocharis obtusa | (Willd.) Schult. | Cyperaceae | 8 |
| Eleocharis parvula | (Roem. & Schult.) Link ex Bluff, Nees & Schauer | Cyperaceae | 8 |
| Eleocharis quadrangulata | (Michx.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis robbinsii | Oakes | Cyperaceae | 8 |
| Eleocharis rostellata | (Torr.) Torr. | Cyperaceae | 8 |
| Eleocharis tuberculosa | (Michx.) Roem. & Schult. | Cyperaceae | 8 |
| Elephantopus carolinianus | Raeusch. | Asteraceae | 8 |
| Elephantopus elatus | Bertol. | Asteraceae | 8 |
| Elephantopus nudatus | A.Gray | Asteraceae | 8 |
| Elephantopus tomentosus | L. | Asteraceae | 8 |
| Elionurus tripsacoides | Willd. | Poaceae | 8 |
| Elodea canadensis | Michx. | Hydrocharitaceae | 8 |
| Eltroplectris calcarata | (Sw.) Garay & H.R.Sweet | Orchidaceae | 8 |
| Elymus macgregorii | R.E.Brooks & J.J.N.Campb. | Poaceae | 8 |
| Elymus riparius | Wiegand | Poaceae | 8 |
| Elymus virginicus | L. | Poaceae | 8 |
| Elytraria caroliniensis | (J.F.Gmel.) Pers. | Acanthaceae | 8 |
| Emilia fosbergii | Nicolson | Asteraceae | 8 |
| Encyclia tampensis | (Lindl.) Small | Orchidaceae | 8 |
| Enemion biternatum | Raf. | Ranunculaceae | 8 |
| Epidendrum amphistomum | A.Rich. | Orchidaceae | 8 |
| Epidendrum conopseum | R.Br. | Orchidaceae | 8 |
| Epidendrum nocturnum | Jacq. | Orchidaceae | 8 |
| Epidendrum rigidum | Jacq. | Orchidaceae | 8 |
| Epifagus virginiana | (L.) Barton | Orobanchaceae | 8 |
| Epigaea repens | L. | Ericaceae | 8 |
| Equisetum hyemale | L. | Equisetaceae | 8 |
| Eragrostis elliottii | (Elliott) S.Watson | Poaceae | 8 |
| Eragrostis hirsuta | (Michx.) Nees | Poaceae | 8 |
| Eragrostis hypnoides | (Lam.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Eragrostis intermedia | Hitchc. | Poaceae | 8 |
| Eragrostis pectinacea | (Michx.) Nees | Poaceae | 8 |
| Eragrostis refracta | (Muhl.) Scribn. | Poaceae | 8 |
| Eragrostis reptans | (Michx.) Nees | Poaceae | 8 |
| Eragrostis secundiflora | J.Presl | Poaceae | 8 |
| Eragrostis spectabilis | (Pursh) Steud. | Poaceae | 8 |
| Erechtites hieraciifolius | (L.) Raf. ex DC. | Asteraceae | 8 |
| Erianthus alopecuroides | (L.) Elliott | Poaceae | 8 |
| Erianthus contortus | Baldwin ex Elliott | Poaceae | 8 |
| Erianthus giganteus | (Walter) P.Beauv. | Poaceae | 8 |
| Erianthus strictus | Baldwin | Poaceae | 8 |
| Erigeron canadensis | L. | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pulchellus | Michx. | Asteraceae | 8 |
| Erigeron quercifolius | Lam. | Asteraceae | 8 |
| Erigeron strigosus | Muhl. ex Willd. | Asteraceae | 8 |
| Erigeron vernus | (L.) Torr. & A.Gray | Asteraceae | 8 |
| Eriocaulon compressum | Lam. | Eriocaulaceae | 8 |
| Eriocaulon decangulare | L. | Eriocaulaceae | 8 |
| Eriocaulon ravenelii | Chapm. | Eriocaulaceae | 8 |
| Eriochloa contracta | Hitchc. | Poaceae | 8 |
| Eriogonum longifolium | Nutt. | Polygonaceae | 8 |
| Eriogonum tomentosum | Michx. | Polygonaceae | 8 |
| Erithalis fruticosa | L. | Rubiaceae | 8 |
| Ernodea littoralis | Sw. | Rubiaceae | 8 |
| Eryngium aquaticum | L. | Apiaceae | 8 |
| Eryngium aromaticum | Baldwin | Apiaceae | 8 |
| Eryngium baldwinii | Spreng. | Apiaceae | 8 |
| Eryngium cuneifolium | Small | Apiaceae | 8 |
| Eryngium integrifolium | Walter | Apiaceae | 8 |
| Eryngium prostratum | Nutt. ex DC. | Apiaceae | 8 |
| Eryngium yuccifolium | Michx. | Apiaceae | 8 |
| Erythrina herbacea | L. | Fabaceae | 8 |
| Erythronium umbilicatum | C.R.Parks & Hardin | Liliaceae | 8 |
| Erythroxylum havanense | Jacq. | Erythroxylaceae | 8 |
| Eugenia axillaris | (Sw.) Willd. | Myrtaceae | 8 |
| Eugenia confusa | DC. | Myrtaceae | 8 |
| Eugenia foetida | Pers. | Myrtaceae | 8 |
| Eulophia alta | (L.) Fawc. & Rendle | Orchidaceae | 8 |
| Eulophia ecristata | (Fernald) Ames | Orchidaceae | 8 |
| Euonymus americanus | L. | Celastraceae | 8 |
| Euonymus atropurpureus | Jacq. | Celastraceae | 8 |
| Eupatorium album | L. | Asteraceae | 8 |
| Eupatorium altissimum | L. | Asteraceae | 8 |
| Eupatorium capillifolium | (Lam.) Small ex Porter & Britton | Asteraceae | 8 |
| Eupatorium compositifolium | Walter | Asteraceae | 8 |
| Eupatorium cuneifolium | Willd. | Asteraceae | 8 |
| Eupatorium hyssopifolium | L. | Asteraceae | 8 |
| Eupatorium leptophyllum | DC. | Asteraceae | 8 |
| Eupatorium leucolepis | Torr. & A.Gray | Asteraceae | 8 |
| Eupatorium mikanioides | Chapm. | Asteraceae | 8 |
| Eupatorium mohrii | Greene | Asteraceae | 8 |
| Eupatorium perfoliatum | L. | Asteraceae | 8 |
| Eupatorium pilosum | Walter | Asteraceae | 8 |
| Eupatorium rotundifolium | L. | Asteraceae | 8 |
| Eupatorium semiserratum | DC. | Asteraceae | 8 |
| Eupatorium serotinum | Michx. | Asteraceae | 8 |
| Euphorbia blodgettii | Engelm. | Euphorbiaceae | 8 |
| Euphorbia bombensis | Jacq. | Euphorbiaceae | 8 |
| Euphorbia commutata | Engelm. ex A.Gray | Euphorbiaceae | 8 |
| Euphorbia conferta | (Small) B.E.Sm. | Euphorbiaceae | 8 |
| Euphorbia cordifolia | Elliott | Euphorbiaceae | 8 |
| Euphorbia cumulicola | (Small) Oudejans | Euphorbiaceae | 8 |
| Euphorbia curtisii | Engelm. ex Chapm. | Euphorbiaceae | 8 |
| Euphorbia discoidalis | Chapm. | Euphorbiaceae | 8 |
| Euphorbia exserta | (Small) Coker | Euphorbiaceae | 8 |
| Euphorbia floridana | Chapm. | Euphorbiaceae | 8 |
| Euphorbia heterophylla | L. | Euphorbiaceae | 8 |
| Euphorbia hirta | L. | Euphorbiaceae | 8 |
| Euphorbia humistrata | Engelm. ex A.Gray | Euphorbiaceae | 8 |
| Euphorbia hypericifolia | L. | Euphorbiaceae | 8 |
| Euphorbia hyssopifolia | L. | Euphorbiaceae | 8 |
| Euphorbia maculata | L. | Euphorbiaceae | 8 |
| Euphorbia mesembryanthemifolia | Jacq. | Euphorbiaceae | 8 |
| Euphorbia nutans | Lag. | Euphorbiaceae | 8 |
| Euphorbia ophthalmica | Pers. | Euphorbiaceae | 8 |
| Euphorbia pergamena | Small | Euphorbiaceae | 8 |
| Euphorbia pinetorum | (Small) G.L.Webster | Euphorbiaceae | 8 |
| Euphorbia polygonifolia | L. | Euphorbiaceae | 8 |
| Euphorbia polyphylla | Engelm. ex Holz. | Euphorbiaceae | 8 |
| Euphorbia porteriana | (Small) Oudejans | Euphorbiaceae | 8 |
| Euphorbia prostrata | Aiton | Euphorbiaceae | 8 |
| Euphorbia pubentissima | Michx. | Euphorbiaceae | 8 |
| Euphorbia serpens | Kunth | Euphorbiaceae | 8 |
| Euphorbia spathulata | Lam. | Euphorbiaceae | 8 |
| Euphorbia telephioides | Chapm. | Euphorbiaceae | 8 |
| Euphorbia thymifolia | L. | Euphorbiaceae | 8 |
| Euphorbia tithymaloides | L. | Euphorbiaceae | 8 |
| Euploca polyphylla | (Lehm.) J.I.M.Melo & Semir | Heliotropiaceae | 8 |
| Eurybia eryngiifolia | (Torr. & A.Gray) G.L.Nesom | Asteraceae | 8 |
| Eurybia paludosa | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Eurybia spinulosa | (Chapm.) G.L.Nesom | Asteraceae | 8 |
| Eustachys glauca | Chapm. | Poaceae | 8 |
| Eustachys petraea | (Sw.) Desv. | Poaceae | 8 |
| Eustoma exaltatum | (L.) Salisb. ex G.Don | Gentianaceae | 8 |
| Euthamia caroliniana | (L.) Greene ex Porter & Britton | Asteraceae | 8 |
| Euthamia scabra | Greene | Asteraceae | 8 |
| Euthamia weakleyi | G.L.Nesom | Asteraceae | 8 |
| Eutrochium fistulosum | (Barratt) E.E.Lamont | Asteraceae | 8 |
| Eutrochium purpureum | (L.) E.E.Lamont | Asteraceae | 8 |
| Evolvulus alsinoides | (L.) L. | Convolvulaceae | 8 |
| Evolvulus sericeus | Sw. | Convolvulaceae | 8 |
| Exostema caribaeum | (Jacq.) Schult. | Rubiaceae | 8 |
| Exothea paniculata | Radlk. | Sapindaceae | 8 |
| Facelis retusa | (Lam.) Sch.Bip. | Asteraceae | 8 |
| Fagus grandifolia | Ehrh. | Fagaceae | 8 |
| Fallopia scandens | (L.) Holub | Polygonaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca subverticillata | (Pers.) E.B.Alexeev | Poaceae | 8 |
| Ficus americana | Aubl. | Moraceae | 8 |
| Ficus aurea | Nutt. | Moraceae | 8 |
| Ficus citrifolia | Mill. | Moraceae | 8 |
| Fimbristylis autumnalis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Fimbristylis caroliniana | (Lam.) Fernald | Cyperaceae | 8 |
| Fimbristylis cymosa | R.Br. | Cyperaceae | 8 |
| Fimbristylis dichotoma | (L.) Vahl | Cyperaceae | 8 |
| Fimbristylis littoralis | Gaudich. | Cyperaceae | 8 |
| Fimbristylis puberula | (Michx.) Vahl | Cyperaceae | 8 |
| Fimbristylis spadicea | (L.) Vahl | Cyperaceae | 8 |
| Fimbristylis vahlii | (Lam.) Link | Cyperaceae | 8 |
| Flaveria floridana | J.R.Johnst. | Asteraceae | 8 |
| Flaveria linearis | Lag. | Asteraceae | 8 |
| Flaveria trinervia | (Spreng.) C.Mohr | Asteraceae | 8 |
| Fleischmannia incarnata | (Walter) R.M.King & H.Rob. | Asteraceae | 8 |
| Forestiera acuminata | (Michx.) Poir. | Oleaceae | 8 |
| Forestiera ligustrina | (Michx.) Poir. | Oleaceae | 8 |
| Forestiera segregata | (Jacq.) Krug & Urb. | Oleaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Frangula caroliniana | (Walter) A.Gray | Rhamnaceae | 8 |
| Fraxinus americana | L. | Oleaceae | 8 |
| Fraxinus caroliniana | Mill. | Oleaceae | 8 |
| Fraxinus pennsylvanica | Marshall | Oleaceae | 8 |
| Fraxinus profunda | (Bush) Bush | Oleaceae | 8 |
| Froelichia floridana | (Nutt.) Moq. | Amaranthaceae | 8 |
| Fuirena breviseta | (Coville) Coville | Cyperaceae | 8 |
| Fuirena scirpoidea | Michx. | Cyperaceae | 8 |
| Fuirena squarrosa | Michx. | Cyperaceae | 8 |
| Fuirena umbellata | Rottb. | Cyperaceae | 8 |
| Funastrum angustifolium | (Pers.) Liede & Meve | Apocynaceae | 8 |
| Funastrum clausum | (Jacq.) Schltr. | Apocynaceae | 8 |
| Gaillardia aestivalis | (Walter) H.Rock | Asteraceae | 8 |
| Galactia elliottii | Nutt. | Fabaceae | 8 |
| Galactia erecta | (Walter) Vail | Fabaceae | 8 |
| Galactia floridana | Torr. & A.Gray | Fabaceae | 8 |
| Galactia microphylla | (Chapm.) H.J.Rogers ex Isely | Fabaceae | 8 |
| Galactia mollis | Michx. | Fabaceae | 8 |
| Galactia pinetorum | Small | Fabaceae | 8 |
| Galactia purshii | Desv. | Fabaceae | 8 |
| Galactia regularis | (L.) Britton, Sterns & Poggenb. | Fabaceae | 8 |
| Galactia striata | (Jacq.) Urb. | Fabaceae | 8 |
| Galium pilosum | Aiton | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Galium uniflorum | Michx. | Rubiaceae | 8 |
| Gamochaeta argyrinea | G.L.Nesom | Asteraceae | 8 |
| Gamochaeta pensylvanica | (Willd.) Cabrera | Asteraceae | 8 |
| Gamochaeta purpurea | (L.) Cabrera | Asteraceae | 8 |
| Garberia heterophylla | (W.Bartram) Merr. & F.Harper | Asteraceae | 8 |
| Gaylussacia mosieri | Small | Ericaceae | 8 |
| Gaylussacia nana | (A.Gray) Small | Ericaceae | 8 |
| Gaylussacia tomentosa | (Pursh ex A.Gray) Small | Ericaceae | 8 |
| Gelsemium rankinii | Small | Gelsemiaceae | 8 |
| Gelsemium sempervirens | (L.) J.St.-Hil. | Gelsemiaceae | 8 |
| Gentiana autumnalis | L. | Gentianaceae | 8 |
| Gentiana catesbaei | Walter | Gentianaceae | 8 |
| Gentiana saponaria | L. | Gentianaceae | 8 |
| Gentiana villosa | L. | Gentianaceae | 8 |
| Geobalanus oblongifolius | (Michx.) Small | Chrysobalanaceae | 8 |
| Geranium bicknellii | Britton | Geraniaceae | 8 |
| Geranium carolinianum | L. | Geraniaceae | 8 |
| Geranium maculatum | L. | Geraniaceae | 8 |
| Gleditsia aquatica | Marshall | Fabaceae | 8 |
| Gleditsia triacanthos | L. | Fabaceae | 8 |
| Glyceria septentrionalis | Hitchc. | Poaceae | 8 |
| Glyceria striata | (Lam.) Hitchc. | Poaceae | 8 |
| Gomphrena serrata | L. | Amaranthaceae | 8 |
| Gomphrena vermicularis | L. | Amaranthaceae | 8 |
| Gonolobus suberosus | (L.) R.Br. | Apocynaceae | 8 |
| Goodyera pubescens | (Willd.) R.Br. | Orchidaceae | 8 |
| Gordonia lasianthus | (L.) Ellis | Theaceae | 8 |
| Gouania lupuloides | (L.) Urb. | Rhamnaceae | 8 |
| Gratiola brevifolia | Raf. | Plantaginaceae | 8 |
| Gratiola floridana | Nutt. | Plantaginaceae | 8 |
| Gratiola hispida | (Benth.) Pollard | Plantaginaceae | 8 |
| Gratiola lutea | Raf. | Plantaginaceae | 8 |
| Gratiola pilosa | Michx. | Plantaginaceae | 8 |
| Gratiola ramosa | Walter | Plantaginaceae | 8 |
| Gratiola virginiana | L. | Plantaginaceae | 8 |
| Grona triflora | (L.) H.Ohashi & K.Ohashi | Fabaceae | 8 |
| Guaiacum officinale | L. | Zygophyllaceae | 8 |
| Guaiacum sanctum | L. | Zygophyllaceae | 8 |
| Guapira discolor | (Spreng.) Little | Nyctaginaceae | 8 |
| Guettarda elliptica | Sw. | Rubiaceae | 8 |
| Guettarda scabra | (L.) Vent. | Rubiaceae | 8 |
| Guzmania monostachia | (L.) Rusby ex Mez | Bromeliaceae | 8 |
| Gymnanthes lucida | Sw. | Euphorbiaceae | 8 |
| Gymnopogon ambiguus | (Michx.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Gymnopogon brevifolius | Trin. | Poaceae | 8 |
| Gymnopogon chapmanianus | Hitchc. | Poaceae | 8 |
| Habenaria floribunda | Lindl. | Orchidaceae | 8 |
| Habenaria macroceratitis | Willd. | Orchidaceae | 8 |
| Habenaria quinqueseta | (Michx.) Eaton | Orchidaceae | 8 |
| Habenaria repens | Nutt. | Orchidaceae | 8 |
| Halesia carolina | L. | Styracaceae | 8 |
| Halesia diptera | J.Ellis | Styracaceae | 8 |
| Halophila engelmannii | Asch. | Hydrocharitaceae | 8 |
| Hamamelis virginiana | L. | Hamamelidaceae | 8 |
| Hamelia patens | Jacq. | Rubiaceae | 8 |
| Harperocallis flava | McDaniel | Tofieldiaceae | 8 |
| Hartwrightia floridana | A.Gray ex S.Watson | Asteraceae | 8 |
| Hedeoma hispida | Pursh | Lamiaceae | 8 |
| Hedeoma pulegioides | (L.) Pers. | Lamiaceae | 8 |
| Helenium amarum | (Raf.) H.Rock | Asteraceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helenium brevifolium | (Nutt.) Alph.Wood | Asteraceae | 8 |
| Helenium flexuosum | Raf. | Asteraceae | 8 |
| Helenium pinnatifidum | (Schwein. ex Nutt.) Rydb. | Asteraceae | 8 |
| Helenium vernale | Walter | Asteraceae | 8 |
| Helianthus agrestis | Pollard | Asteraceae | 8 |
| Helianthus angustifolius | L. | Asteraceae | 8 |
| Helianthus argophyllus | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus atrorubens | L. | Asteraceae | 8 |
| Helianthus carnosus | Small | Asteraceae | 8 |
| Helianthus debilis | Nutt. | Asteraceae | 8 |
| Helianthus divaricatus | L. | Asteraceae | 8 |
| Helianthus heterophyllus | Nutt. | Asteraceae | 8 |
| Helianthus hirsutus | Raf. | Asteraceae | 8 |
| Helianthus microcephalus | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus occidentalis | Riddell | Asteraceae | 8 |
| Helianthus radula | (Pursh) Torr. & A.Gray | Asteraceae | 8 |
| Helianthus resinosus | Small | Asteraceae | 8 |
| Helianthus simulans | E.Watson | Asteraceae | 8 |
| Helianthus strumosus | L. | Asteraceae | 8 |
| Helianthus tuberosus | L. | Asteraceae | 8 |
| Heliopsis gracilis | Nutt. | Asteraceae | 8 |
| Heliotropium angiospermum | Murray | Heliotropiaceae | 8 |
| Heliotropium curassavicum | L. | Heliotropiaceae | 8 |
| Heliotropium verdcourtii | Craven | Heliotropiaceae | 8 |
| Hepatica americana | (DC.) Ker Gawl. | Ranunculaceae | 8 |
| Herissantia crispa | (L.) Brizicky | Malvaceae | 8 |
| Heteranthera dubia | (Jacq.) MacMill. | Pontederiaceae | 8 |
| Heteranthera limosa | (Sw.) Willd. | Pontederiaceae | 8 |
| Heteranthera reniformis | Ruiz & Pav. | Pontederiaceae | 8 |
| Heteropogon contortus | (L.) P.Beauv. ex Roem. & Schult. | Poaceae | 8 |
| Heteropogon melanocarpus | (Elliott) Benth. | Poaceae | 8 |
| Heterotheca subaxillaris | (Lam.) Britton & Rusby | Asteraceae | 8 |
| Hexasepalum teres | (Walter) J.H.Kirkbr. | Rubiaceae | 8 |
| Hibiscus poeppigii | Garcke | Malvaceae | 8 |
| Hieracium gronovii | L. | Asteraceae | 8 |
| Hieracium megacephalon | Nash | Asteraceae | 8 |
| Hippocratea volubilis | L. | Celastraceae | 8 |
| Hippomane mancinella | L. | Euphorbiaceae | 8 |
| Houstonia longifolia | Gaertn. | Rubiaceae | 8 |
| Houstonia micrantha | (Shinners) Terrell | Rubiaceae | 8 |
| Houstonia procumbens | (Walter ex J.F.Gmel.) Standl. | Rubiaceae | 8 |
| Houstonia pusilla | Schoepf | Rubiaceae | 8 |
| Hybanthus concolor | Spreng. | Violaceae | 8 |
| Hydrangea arborescens | L. | Hydrangeaceae | 8 |
| Hydrangea barbara | (L.) Bernd Schulz | Hydrangeaceae | 8 |
| Hydrangea quercifolia | W.Bartram | Hydrangeaceae | 8 |
| Hydrocharis spongia | Bosc | Hydrocharitaceae | 8 |
| Hydrocotyle bonariensis | Comm. ex Lam. | Araliaceae | 8 |
| Hydrocotyle ranunculoides | L.f. | Araliaceae | 8 |
| Hydrocotyle umbellata | L. | Araliaceae | 8 |
| Hydrocotyle verticillata | Thunb. | Araliaceae | 8 |
| Hydrogalium claytonii | (Michx.) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrolea corymbosa | Elliott | Hydroleaceae | 8 |
| Hydrolea ovata | Nutt. | Hydroleaceae | 8 |
| Hydrolea quadrivalvis | Walter | Hydroleaceae | 8 |
| Hylodesmum glutinosum | (Muhl. ex Willd.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hylodesmum nudiflorum | (L.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hylodesmum pauciflorum | (Nutt.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hymenocallis latifolia | (Mill.) M.Roem. | Amaryllidaceae | 8 |
| Hymenocallis occidentalis | (Leconte) Kunth | Amaryllidaceae | 8 |
| Hymenocallis palmeri | S.Watson | Amaryllidaceae | 8 |
| Hymenocallis rotata | (Ker Gawl.) Herb. | Amaryllidaceae | 8 |
| Hymenopappus scabiosaeus | L'Hér. | Asteraceae | 8 |
| Hypericum brachyphyllum | (Spach) Steud. | Hypericaceae | 8 |
| Hypericum canadense | L. | Hypericaceae | 8 |
| Hypericum chapmanii | P.B.Adams | Hypericaceae | 8 |
| Hypericum cistifolium | Lam. | Hypericaceae | 8 |
| Hypericum crux-andreae | (L.) Crantz | Hypericaceae | 8 |
| Hypericum cumulicola | (Small) P.B.Adams | Hypericaceae | 8 |
| Hypericum drummondii | (Grev. & Hook.) Torr. & A.Gray | Hypericaceae | 8 |
| Hypericum edisonianum | (Small) P.B.Adams & N.Robson | Hypericaceae | 8 |
| Hypericum fasciculatum | Lam. | Hypericaceae | 8 |
| Hypericum frondosum | Michx. | Hypericaceae | 8 |
| Hypericum galioides | Lam. | Hypericaceae | 8 |
| Hypericum gentianoides | (L.) Britton, Sterns & Poggenb. | Hypericaceae | 8 |
| Hypericum gymnanthum | Engelm. & A.Gray | Hypericaceae | 8 |
| Hypericum hypericoides | (L.) Crantz | Hypericaceae | 8 |
| Hypericum microsepalum | (Torr. & A.Gray) A.Gray | Hypericaceae | 8 |
| Hypericum mutilum | L. | Hypericaceae | 8 |
| Hypericum myrtifolium | Lam. | Hypericaceae | 8 |
| Hypericum nudiflorum | Michx. ex Willd. | Hypericaceae | 8 |
| Hypericum prolificum | L. | Hypericaceae | 8 |
| Hypericum pseudomaculatum | Bush | Hypericaceae | 8 |
| Hypericum punctatum | Lam. | Hypericaceae | 8 |
| Hypericum setosum | L. | Hypericaceae | 8 |
| Hypericum suffruticosum | P.B.Adams & N.Robson | Hypericaceae | 8 |
| Hypericum tenuifolium | Pursh | Hypericaceae | 8 |
| Hypericum tetrapetalum | Lam. | Hypericaceae | 8 |
| Hypericum tubulosum | Walter | Hypericaceae | 8 |
| Hypericum virgatum | Lam. | Hypericaceae | 8 |
| Hypericum virginicum | L. | Hypericaceae | 8 |
| Hypericum walteri | J.F.Gmel. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Hypoxis curtissii | Rose | Hypoxidaceae | 8 |
| Hypoxis juncea | Sm. | Hypoxidaceae | 8 |
| Hypoxis wrightii | (Baker) Brackett | Hypoxidaceae | 8 |
| Hyptis alata | (Raf.) Shinners | Lamiaceae | 8 |
| Hyptis capitata | Jacq. | Lamiaceae | 8 |
| Ilex ambigua | (Michx.) Torr. | Aquifoliaceae | 8 |
| Ilex cassine | L. | Aquifoliaceae | 8 |
| Ilex coriacea | (Pursh) Chapm. | Aquifoliaceae | 8 |
| Ilex decidua | Walter | Aquifoliaceae | 8 |
| Ilex glabra | (L.) A.Gray | Aquifoliaceae | 8 |
| Ilex myrtifolia | Walter | Aquifoliaceae | 8 |
| Ilex opaca | Aiton | Aquifoliaceae | 8 |
| Ilex verticillata | (L.) A.Gray | Aquifoliaceae | 8 |
| Ilex vomitoria | Aiton | Aquifoliaceae | 8 |
| Illicium floridanum | J.Ellis | Schisandraceae | 8 |
| Illicium parviflorum | Michx. ex Vent. | Schisandraceae | 8 |
| Impatiens capensis | Meerb. | Balsaminaceae | 8 |
| Indigofera caroliniana | Mill. | Fabaceae | 8 |
| Indigofera miniata | Ortega | Fabaceae | 8 |
| Indigofera suffruticosa | Mill. | Fabaceae | 8 |
| Ionactis linariifolia | (L.) Greene | Asteraceae | 8 |
| Ionopsis utricularioides | (Sw.) Lindl. | Orchidaceae | 8 |
| Ipomoea coccinea | L. | Convolvulaceae | 8 |
| Ipomoea cordatotriloba | Dennst. | Convolvulaceae | 8 |
| Ipomoea hederifolia | L. | Convolvulaceae | 8 |
| Ipomoea imperati | (Vahl) Griseb. | Convolvulaceae | 8 |
| Ipomoea indica | (Burm.) Merr. | Convolvulaceae | 8 |
| Ipomoea lacunosa | L. | Convolvulaceae | 8 |
| Ipomoea microdactyla | Griseb. | Convolvulaceae | 8 |
| Ipomoea pandurata | G.Mey. | Convolvulaceae | 8 |
| Ipomoea pes-caprae | (L.) R.Br. | Convolvulaceae | 8 |
| Ipomoea sagittata | Poir. | Convolvulaceae | 8 |
| Ipomoea violacea | L. | Convolvulaceae | 8 |
| Ipomopsis rubra | (L.) Wherry | Polemoniaceae | 8 |
| Iresine diffusa | Humb. & Bonpl. ex Willd. | Amaranthaceae | 8 |
| Iresine rhizomatosa | Standl. | Amaranthaceae | 8 |
| Iris brevicaulis | Raf. | Iridaceae | 8 |
| Iris savannarum | Small | Iridaceae | 8 |
| Iris tridentata | Pursh | Iridaceae | 8 |
| Iris verna | L. | Iridaceae | 8 |
| Iris virginica | L. | Iridaceae | 8 |
| Isolepis carinata | Hook. & Arn. ex Torr. | Cyperaceae | 8 |
| Isotria verticillata | (Muhl. ex Willd.) Raf. | Orchidaceae | 8 |
| Itea virginica | L. | Iteaceae | 8 |
| Iva annua | L. | Asteraceae | 8 |
| Iva frutescens | L. | Asteraceae | 8 |
| Iva imbricata | Walter | Asteraceae | 8 |
| Iva microcephala | Nutt. | Asteraceae | 8 |
| Jacquemontia havanensis | (Jacq.) Urb. | Convolvulaceae | 8 |
| Jacquemontia tamnifolia | (L.) Griseb. | Convolvulaceae | 8 |
| Jacquinia keyensis | Mez | Primulaceae | 8 |
| Juglans nigra | L. | Juglandaceae | 8 |
| Juncus acuminatus | Michx. | Juncaceae | 8 |
| Juncus biflorus | Elliott | Juncaceae | 8 |
| Juncus brachycarpus | Engelm. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus canadensis | J.Gay ex Laharpe | Juncaceae | 8 |
| Juncus coriaceus | Mack. | Juncaceae | 8 |
| Juncus dichotomus | Elliott | Juncaceae | 8 |
| Juncus diffusissimus | Buckley | Juncaceae | 8 |
| Juncus effusus | L. | Juncaceae | 8 |
| Juncus marginatus | Rostk. | Juncaceae | 8 |
| Juncus megacephalus | M.A.Curtis | Juncaceae | 8 |
| Juncus paludosus | E.L.Bridges & Orzell | Juncaceae | 8 |
| Juncus pelocarpus | E.Mey. | Juncaceae | 8 |
| Juncus polycephalus | Michx. | Juncaceae | 8 |
| Juncus repens | Michx. | Juncaceae | 8 |
| Juncus roemerianus | Scheele | Juncaceae | 8 |
| Juncus scirpoides | Lam. | Juncaceae | 8 |
| Juncus tenuis | Willd. | Juncaceae | 8 |
| Juncus trigonocarpus | Steud. | Juncaceae | 8 |
| Juncus validus | Coville | Juncaceae | 8 |
| Juniperus virginiana | L. | Cupressaceae | 8 |
| Justicia lanceolata | (Chapm.) Small | Acanthaceae | 8 |
| Kallstroemia maxima | (L.) Hook. & Arn. | Zygophyllaceae | 8 |
| Kalmia hirsuta | Walter | Ericaceae | 8 |
| Kalmia latifolia | L. | Ericaceae | 8 |
| Kellochloa brachyantha | (Steud.) Lizarazu, Nicola & Scataglini | Poaceae | 8 |
| Kellochloa verrucosa | (Muhl.) Lizarazu, Nicola & Scataglini | Poaceae | 8 |
| Koanophyllon villosum | (Sw.) R.M.King & H.Rob. | Asteraceae | 8 |
| Kosteletzkya depressa | (L.) O.J.Blanch., Fryxell & D.M.Bates | Malvaceae | 8 |
| Kosteletzkya pentacarpos | (L.) Ledeb. | Malvaceae | 8 |
| Krameria lanceolata | Torr. | Krameriaceae | 8 |
| Krigia cespitosa | (Raf.) K.L.Chambers | Asteraceae | 8 |
| Krigia dandelion | (L.) Nutt. | Asteraceae | 8 |
| Krigia virginica | (L.) Willd. | Asteraceae | 8 |
| Krugiodendron ferreum | (Vahl) Urb. | Rhamnaceae | 8 |
| Kummerowia striata | (Thunb.) Schindl. | Fabaceae | 8 |
| Lackeya multiflora | (Torr. & A.Gray) Fortunato, L.P.Queiroz & G.P.Lewis | Fabaceae | 8 |
| Lactuca canadensis | L. | Asteraceae | 8 |
| Lactuca floridana | (L.) Gaertn. | Asteraceae | 8 |
| Lactuca graminifolia | Michx. | Asteraceae | 8 |
| Laguncularia racemosa | (L.) C.F.Gaertn. | Combretaceae | 8 |
| Lantana depressa | Small | Verbenaceae | 8 |
| Laportea canadensis | (L.) Wedd. | Urticaceae | 8 |
| Lasiacis divaricata | (L.) Hitchc. | Poaceae | 8 |
| Lathyrus pusillus | Elliott | Fabaceae | 8 |
| Lechea cernua | Small | Cistaceae | 8 |
| Lechea deckertii | Small | Cistaceae | 8 |
| Lechea divaricata | Shuttlew. ex Britton | Cistaceae | 8 |
| Lechea minor | L. | Cistaceae | 8 |
| Lechea mucronata | Raf. | Cistaceae | 8 |
| Lechea sessiliflora | Raf. | Cistaceae | 8 |
| Lechea torreyi | (Chapm.) Legg. ex Britton | Cistaceae | 8 |
| Leersia hexandra | Sw. | Poaceae | 8 |
| Leersia lenticularis | Michx. | Poaceae | 8 |
| Leersia monandra | Sw. | Poaceae | 8 |
| Leersia oryzoides | (L.) Sw. | Poaceae | 8 |
| Leersia virginica | Willd. | Poaceae | 8 |
| Leitneria floridana | Chapm. | Simaroubaceae | 8 |
| Lemna aequinoctialis | Welw. | Araceae | 8 |
| Lemna gibba | L. | Araceae | 8 |
| Lemna minor | L. | Araceae | 8 |
| Lemna minuta | Kunth | Araceae | 8 |
| Lemna trisulca | L. | Araceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Lepidium virginicum | L. | Brassicaceae | 8 |
| Leptochloa nealleyi | Vasey | Poaceae | 8 |
| Leptochloa panicea | (Retz.) Ohwi | Poaceae | 8 |
| Leptochloa panicoides | (J.Presl) Hitchc. | Poaceae | 8 |
| Lepuropetalon spathulatum | Elliott | Celastraceae | 8 |
| Lespedeza angustifolia | (Pursh) Elliott | Fabaceae | 8 |
| Lespedeza capitata | Michx. | Fabaceae | 8 |
| Lespedeza frutescens | (L.) Hornem. | Fabaceae | 8 |
| Lespedeza hirta | (L.) Hornem. | Fabaceae | 8 |
| Lespedeza procumbens | Michx. | Fabaceae | 8 |
| Lespedeza stuevei | Nutt. | Fabaceae | 8 |
| Lespedeza virginica | (L.) Britton | Fabaceae | 8 |
| Leucospora multifida | (Michx.) Nutt. | Plantaginaceae | 8 |
| Leucothoe axillaris | (Lam.) D.Don | Ericaceae | 8 |
| Leucothrinax morrisii | (H.Wendl.) C.Lewis & Zona | Arecaceae | 8 |
| Liatris aspera | Michx. | Asteraceae | 8 |
| Liatris chapmanii | Torr. & A.Gray | Asteraceae | 8 |
| Liatris elegans | (Walter) Michx. | Asteraceae | 8 |
| Liatris elegantula | K.Schum. | Asteraceae | 8 |
| Liatris garberi | A.Gray | Asteraceae | 8 |
| Liatris gracilis | Pursh | Asteraceae | 8 |
| Liatris laevigata | Nutt. | Asteraceae | 8 |
| Liatris patens | Kral & G.L.Nesom | Asteraceae | 8 |
| Liatris pauciflora | Pursh | Asteraceae | 8 |
| Liatris spicata | (L.) Willd. | Asteraceae | 8 |
| Liatris squarrosa | (L.) Willd. | Asteraceae | 8 |
| Liatris tenuifolia | Nutt. | Asteraceae | 8 |
| Licaria triandra | (Sw.) Kosterm. | Lauraceae | 8 |
| Lilaeopsis carolinensis | J.M.Coult. & Rose | Apiaceae | 8 |
| Lilaeopsis chinensis | (L.) Kuntze | Apiaceae | 8 |
| Lilium catesbaei | Walter | Liliaceae | 8 |
| Lilium michauxii | Poir. | Liliaceae | 8 |
| Lilium superbum | L. | Liliaceae | 8 |
| Limnodea arkansana | (Nutt.) L.H.Dewey | Poaceae | 8 |
| Limonium carolinianum | (Walter) Britton | Plumbaginaceae | 8 |
| Lindera benzoin | (L.) Blume | Lauraceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Lindernia grandiflora | Nutt. | Linderniaceae | 8 |
| Lindernia monticola | Nutt. | Linderniaceae | 8 |
| Linum floridanum | (Planch.) Trel. | Linaceae | 8 |
| Linum medium | (Planch.) Britton | Linaceae | 8 |
| Linum striatum | Walter | Linaceae | 8 |
| Linum sulcatum | Riddell | Linaceae | 8 |
| Liparis nervosa | (Thunb.) Lindl. | Orchidaceae | 8 |
| Lippia alba | (Mill.) N.E.Br. ex Britton & P.Wilson | Verbenaceae | 8 |
| Liquidambar styraciflua | L. | Altingiaceae | 8 |
| Liriodendron tulipifera | L. | Magnoliaceae | 8 |
| Lithospermum caroliniense | (J.F.Gmel.) MacMill. | Boraginaceae | 8 |
| Lithospermum incisum | Lehm. | Boraginaceae | 8 |
| Lithospermum tuberosum | Rugel ex A.DC. | Boraginaceae | 8 |
| Lithospermum virginianum | L. | Boraginaceae | 8 |
| Litrisa carnosa | Small | Asteraceae | 8 |
| Litsea aestivalis | (L.) Fernald | Lauraceae | 8 |
| Lobelia amoena | Michx. | Campanulaceae | 8 |
| Lobelia brevifolia | Nutt. ex A.DC. | Campanulaceae | 8 |
| Lobelia cardinalis | L. | Campanulaceae | 8 |
| Lobelia feayana | A.Gray | Campanulaceae | 8 |
| Lobelia floridana | Chapm. | Campanulaceae | 8 |
| Lobelia georgiana | McVaugh | Campanulaceae | 8 |
| Lobelia glandulosa | Walter | Campanulaceae | 8 |
| Lobelia homophylla | E.Wimm. | Campanulaceae | 8 |
| Lobelia nuttallii | Roem. & Schult. | Campanulaceae | 8 |
| Lobelia paludosa | Nutt. | Campanulaceae | 8 |
| Lobelia puberula | Michx. | Campanulaceae | 8 |
| Lonicera sempervirens | L. | Caprifoliaceae | 8 |
| Lophiola aurea | Ker Gawl. | Nartheciaceae | 8 |
| Lorinseria areolata | (L.) C.Presl | Blechnaceae | 8 |
| Ludwigia alternifolia | L. | Onagraceae | 8 |
| Ludwigia arcuata | Walter | Onagraceae | 8 |
| Ludwigia bonariensis | (Micheli) H.Hara | Onagraceae | 8 |
| Ludwigia curtissii | Chapm. | Onagraceae | 8 |
| Ludwigia decurrens | Walter | Onagraceae | 8 |
| Ludwigia erecta | (L.) H.Hara | Onagraceae | 8 |
| Ludwigia glandulosa | Walter | Onagraceae | 8 |
| Ludwigia grandiflora | (Michx.) Greuter & Burdet | Onagraceae | 8 |
| Ludwigia hexapetala | (Hook. & Arn.) Zardini, H.Y.Gu & P.H.Raven | Onagraceae | 8 |
| Ludwigia hirtella | Raf. | Onagraceae | 8 |
| Ludwigia leptocarpa | (Nutt.) H.Hara | Onagraceae | 8 |
| Ludwigia linearis | Walter | Onagraceae | 8 |
| Ludwigia linifolia | Poir. | Onagraceae | 8 |
| Ludwigia maritima | R.M.Harper | Onagraceae | 8 |
| Ludwigia microcarpa | Michx. | Onagraceae | 8 |
| Ludwigia octovalvis | (Jacq.) P.H.Raven | Onagraceae | 8 |
| Ludwigia palustris | (L.) Elliott | Onagraceae | 8 |
| Ludwigia peploides | (Kunth) P.H.Raven | Onagraceae | 8 |
| Ludwigia pilosa | Walter | Onagraceae | 8 |
| Ludwigia repens | J.R.Forst. | Onagraceae | 8 |
| Ludwigia suffruticosa | Walter | Onagraceae | 8 |
| Ludwigia virgata | Michx. | Onagraceae | 8 |
| Lupinus cumulicola | Small | Fabaceae | 8 |
| Lupinus diffusus | Nutt. | Fabaceae | 8 |
| Lupinus floridanus | E.L.Bridges & Orzell | Fabaceae | 8 |
| Lupinus ocalensis | E.L.Bridges & Orzell | Fabaceae | 8 |
| Lupinus perennis | L. | Fabaceae | 8 |
| Lupinus pilosior | E.L.Bridges & Orzell | Fabaceae | 8 |
| Lupinus villosus | Willd. | Fabaceae | 8 |
| Luziola fluitans | (Michx.) Terrell & H.Rob. | Poaceae | 8 |
| Luzula acuminata | Raf. | Juncaceae | 8 |
| Luzula bulbosa | (Alph.Wood) Smyth & L.C.R.Smyth | Juncaceae | 8 |
| Luzula echinata | (Small) F.J.Herm. | Juncaceae | 8 |
| Lycium carolinianum | Walter | Solanaceae | 8 |
| Lycopodiella alopecuroides | (L.) Cranfill | Lycopodiaceae | 8 |
| Lycopodiella appressa | (Chapm.) Cranfill | Lycopodiaceae | 8 |
| Lycopodiella prostrata | (R.M.Harper) Cranfill | Lycopodiaceae | 8 |
| Lycopus americanus | Muhl. ex W.P.C.Barton | Lamiaceae | 8 |
| Lycopus amplectens | Raf. | Lamiaceae | 8 |
| Lycopus angustifolius | Elliott | Lamiaceae | 8 |
| Lycopus rubellus | Moench | Lamiaceae | 8 |
| Lycopus virginicus | L. | Lamiaceae | 8 |
| Lygodesmia aphylla | (Nutt.) DC. | Asteraceae | 8 |
| Lygodium palmatum | (Bernh.) Sw. | Lygodiaceae | 8 |
| Lyonia ferruginea | Nutt. | Ericaceae | 8 |
| Lyonia fruticosa | (Michx.) G.S.Torr. ex B.L.Rob. | Ericaceae | 8 |
| Lyonia ligustrina | (L.) DC. | Ericaceae | 8 |
| Lyonia lucida | (Lam.) K.Koch | Ericaceae | 8 |
| Lyonia mariana | (L.) D.Don | Ericaceae | 8 |
| Lysiloma latisiliquum | (L.) Benth. | Fabaceae | 8 |
| Lysimachia ciliata | L. | Primulaceae | 8 |
| Lysimachia hybrida | Michx. | Primulaceae | 8 |
| Lysimachia lanceolata | Walter | Primulaceae | 8 |
| Lysimachia minima | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia ovalis | (Ruiz & Pav.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia radicans | Hook. | Primulaceae | 8 |
| Lythrum alatum | Pursh | Lythraceae | 8 |
| Lythrum flagellare | Shuttlew. ex Chapm. | Lythraceae | 8 |
| Lythrum lineare | L. | Lythraceae | 8 |
| Macranthera flammea | (W.Bartram) Pennell | Orobanchaceae | 8 |
| Macroptilium lathyroides | (L.) Urb. | Fabaceae | 8 |
| Magnolia acuminata | (L.) L. | Magnoliaceae | 8 |
| Magnolia ashei | Weath. | Magnoliaceae | 8 |
| Magnolia fraseri | Walter | Magnoliaceae | 8 |
| Magnolia grandiflora | L. | Magnoliaceae | 8 |
| Magnolia tripetala | (L.) L. | Magnoliaceae | 8 |
| Magnolia virginiana | L. | Magnoliaceae | 8 |
| Maianthemum racemosum | (L.) Link | Asparagaceae | 8 |
| Malachra capitata | (L.) L. | Malvaceae | 8 |
| Malaxis spicata | Sw. | Orchidaceae | 8 |
| Malaxis unifolia | Michx. | Orchidaceae | 8 |
| Malus angustifolia | (Aiton) Michx. | Rosaceae | 8 |
| Malvastrum americanum | (L.) Torr. | Malvaceae | 8 |
| Malvastrum coromandelianum | (L.) Garcke | Malvaceae | 8 |
| Marshallia graminifolia | (Walter) Small | Asteraceae | 8 |
| Marshallia obovata | (Walter) Beadle & F.E.Boynton | Asteraceae | 8 |
| Marsilea vestita | Hook. & Grev. | Marsileaceae | 8 |
| Mayaca fluviatilis | Aubl. | Mayacaceae | 8 |
| Maytenus phyllanthoides | Benth. | Celastraceae | 8 |
| Mecardonia acuminata | (Walter) Small | Plantaginaceae | 8 |
| Mecardonia procumbens | (Mill.) Small | Plantaginaceae | 8 |
| Medeola virginiana | L. | Liliaceae | 8 |
| Melanthera angustifolia | A.Rich. | Asteraceae | 8 |
| Melanthera nivea | (L.) Small | Asteraceae | 8 |
| Melanthera parvifolia | Small | Asteraceae | 8 |
| Melanthium virginicum | L. | Melanthiaceae | 8 |
| Melanthium woodii | (J.W.Robbins ex Alph.Wood) Bodkin | Melanthiaceae | 8 |
| Melica mutica | Walter | Poaceae | 8 |
| Melochia nodiflora | Sw. | Malvaceae | 8 |
| Melochia pyramidata | L. | Malvaceae | 8 |
| Melochia tomentosa | L. | Malvaceae | 8 |
| Melothria pendula | L. | Cucurbitaceae | 8 |
| Meniscium reticulatum | (L.) Martyn | Thelypteridaceae | 8 |
| Meniscium serratum | Cav. | Thelypteridaceae | 8 |
| Menispermum canadense | L. | Menispermaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Mentzelia floridana | Nutt. | Loasaceae | 8 |
| Mesadenus lucayanus | (Britton) Schltr. | Orchidaceae | 8 |
| Mesosphaerum pectinatum | (L.) Kuntze | Lamiaceae | 8 |
| Metopium toxiferum | (L.) Krug & Urb. | Anacardiaceae | 8 |
| Miconia bicolor | (Mill.) Triana | Melastomataceae | 8 |
| Micranthemum glomeratum | (Chapm.) Shinners | Linderniaceae | 8 |
| Micranthemum umbrosum | (J.F.Gmel.) S.F.Blake | Linderniaceae | 8 |
| Microchilus querceticola | (Lindl.) D.Dietr. | Orchidaceae | 8 |
| Microgramma heterophylla | (L.) Wherry | Polypodiaceae | 8 |
| Mikania cordifolia | (L.f.) Willd. | Asteraceae | 8 |
| Mikania micrantha | Kunth | Asteraceae | 8 |
| Mikania scandens | (L.) Willd. | Asteraceae | 8 |
| Mimosa floridana | (Chapm.) Weakley & Flores-Cruz | Fabaceae | 8 |
| Mimosa microphylla | Dryand. ex Sm. | Fabaceae | 8 |
| Mimosa pigra | L. | Fabaceae | 8 |
| Mimosa strigillosa | Torr. & A.Gray | Fabaceae | 8 |
| Mimulus alatus | Aiton | Phrymaceae | 8 |
| Mitchella repens | L. | Rubiaceae | 8 |
| Mitreola petiolata | (J.F.Gmel.) Torr. & A.Gray | Loganiaceae | 8 |
| Mitreola sessilifolia | (J.F.Gmel.) G.Don | Loganiaceae | 8 |
| Mollugo verticillata | L. | Molluginaceae | 8 |
| Monarda fistulosa | L. | Lamiaceae | 8 |
| Monarda punctata | L. | Lamiaceae | 8 |
| Monotropa uniflora | L. | Ericaceae | 8 |
| Monotropsis odorata | Schweinitz | Ericaceae | 8 |
| Morinda royoc | L. | Rubiaceae | 8 |
| Morisonia cynophallophora | (L.) Christenh. & Byng | Capparaceae | 8 |
| Morisonia flexuosa | L. | Capparaceae | 8 |
| Morus rubra | L. | Moraceae | 8 |
| Mosiera longipes | (O.Berg) Small | Myrtaceae | 8 |
| Mucuna sloanei | Fawc. & Rendle | Fabaceae | 8 |
| Muenchhusia laevis | (All.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muenchhusia moscheutos | (L.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muhlenbergia capillaris | (Lam.) Trin. | Poaceae | 8 |
| Muhlenbergia expansa | (Poir.) Trin. | Poaceae | 8 |
| Muhlenbergia schreberi | J.F.Gmel. | Poaceae | 8 |
| Muhlenbergia sericea | (Michx.) P.M.Peterson | Poaceae | 8 |
| Myosotis macrosperma | Engelm. | Boraginaceae | 8 |
| Myrcia chytraculia | (L.) A.R.Lourenço & E.Lucas | Myrtaceae | 8 |
| Myrcianthes fragrans | (Sw.) McVaugh | Myrtaceae | 8 |
| Myrica caroliniensis | Mill. | Myricaceae | 8 |
| Myrica cerifera | L. | Myricaceae | 8 |
| Myrica inodora | W.Bartram | Myricaceae | 8 |
| Myriophyllum heterophyllum | Michx. | Haloragaceae | 8 |
| Myriophyllum pinnatum | (Walter) Britton, Sterns & Poggenb. | Haloragaceae | 8 |
| Myriopteris alabamensis | (Buckley) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris lanosa | (Michx.) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris microphylla | (Sw.) Grusz & Windham | Pteridaceae | 8 |
| Myriopus volubilis | (L.) Small | Heliotropiaceae | 8 |
| Myrsine cubana | A.DC. | Primulaceae | 8 |
| Nabalus autumnalis | (Walter) Weakley | Asteraceae | 8 |
| Nabalus serpentaria | (Pursh) Hook. | Asteraceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Najas marina | L. | Hydrocharitaceae | 8 |
| Nama jamaicensis | L. | Namaceae | 8 |
| Nekemias arborea | (L.) J.Wen & Boggan | Vitaceae | 8 |
| Nelumbo lutea | (Willd.) Pers. | Nelumbonaceae | 8 |
| Nemophila aphylla | (L.) Brummitt | Hydrophyllaceae | 8 |
| Neottia bifolia | (Raf.) Baumbach | Orchidaceae | 8 |
| Nephroia carolina | (L.) L.Lian & Wei Wang | Menispermaceae | 8 |
| Nephrolepis biserrata | (Sw.) Schott | Nephrolepidaceae | 8 |
| Nephrolepis exaltata | (L.) Schott | Nephrolepidaceae | 8 |
| Neptunia pubescens | Benth. | Fabaceae | 8 |
| Nolina atopocarpa | Bartlett | Asparagaceae | 8 |
| Nolina brittoniana | Nash | Asparagaceae | 8 |
| Nothoscordum bivalve | (L.) Britton | Amaryllidaceae | 8 |
| Nuphar advena | (Aiton) W.T.Aiton | Nymphaeaceae | 8 |
| Nuttallanthus canadensis | (L.) D.A.Sutton | Plantaginaceae | 8 |
| Nuttallanthus floridanus | (Chapm.) D.A.Sutton | Plantaginaceae | 8 |
| Nuttallanthus texanus | (Scheele) D.A.Sutton | Plantaginaceae | 8 |
| Nymphaea ampla | (Salisb.) DC. | Nymphaeaceae | 8 |
| Nymphaea elegans | Hook. | Nymphaeaceae | 8 |
| Nymphaea mexicana | Zucc. | Nymphaeaceae | 8 |
| Nymphaea odorata | Aiton | Nymphaeaceae | 8 |
| Nymphoides aquatica | (J.F.Gmel.) Kuntze | Menyanthaceae | 8 |
| Nymphoides cordata | (Elliott) Fernald | Menyanthaceae | 8 |
| Nymphoides humboldtiana | (Kunth) Kuntze | Menyanthaceae | 8 |
| Nyssa aquatica | L. | Nyssaceae | 8 |
| Nyssa biflora | Walter | Nyssaceae | 8 |
| Nyssa ogeche | W.Bartram ex Marshall | Nyssaceae | 8 |
| Nyssa sylvatica | Marshall | Nyssaceae | 8 |
| Obolaria virginica | L. | Gentianaceae | 8 |
| Ocimum campechianum | Mill. | Lamiaceae | 8 |
| Oclemena reticulata | (Pursh) G.L.Nesom | Asteraceae | 8 |
| Odontostephana baldwyniana | (Sweet) Alexander | Apocynaceae | 8 |
| Odontostephana floridana | (Vail) Alexander | Apocynaceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera drummondii | Hook. | Onagraceae | 8 |
| Oenothera filipes | (Spach) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera fruticosa | L. | Onagraceae | 8 |
| Oenothera humifusa | Nutt. | Onagraceae | 8 |
| Oenothera laciniata | Hill | Onagraceae | 8 |
| Oenothera linifolia | Nutt. | Onagraceae | 8 |
| Oenothera simulans | (Small) W.L.Wagner & Hoch | Onagraceae | 8 |
| Okenia hypogaea | Schltdl. & Cham. | Nyctaginaceae | 8 |
| Oldenlandia boscii | (DC.) Chapm. | Rubiaceae | 8 |
| Onoclea sensibilis | L. | Onocleaceae | 8 |
| Ophioglossum crotalophoroides | Walter | Ophioglossaceae | 8 |
| Ophioglossum engelmannii | Prantl | Ophioglossaceae | 8 |
| Oplismenus compositus | (L.) P.Beauv. | Poaceae | 8 |
| Oplismenus hirtellus | (L.) P.Beauv. | Poaceae | 8 |
| Opuntia drummondii | Graham | Cactaceae | 8 |
| Opuntia mesacantha | Raf. | Cactaceae | 8 |
| Opuntia stricta | (Haw.) Haw. | Cactaceae | 8 |
| Orbexilum pedunculatum | (Mill.) Rydb. | Fabaceae | 8 |
| Orbexilum psoralioides | (Walter) Vincent | Fabaceae | 8 |
| Orobanche ludoviciana | Nutt. | Orobanchaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Orontium aquaticum | L. | Araceae | 8 |
| Orthosia scoparia | (Nutt.) Liede & Meve | Apocynaceae | 8 |
| Osmunda spectabilis | Willd. | Osmundaceae | 8 |
| Osmundastrum cinnamomeum | (L.) C.Presl | Osmundaceae | 8 |
| Ostrya virginiana | (Mill.) K.Koch | Betulaceae | 8 |
| Oxalis colorea | (Small) R.Knuth | Oxalidaceae | 8 |
| Oxalis dillenii | Jacq. | Oxalidaceae | 8 |
| Oxalis florida | Salisb. | Oxalidaceae | 8 |
| Oxalis violacea | L. | Oxalidaceae | 8 |
| Oxydendrum arboreum | (L.) DC. | Ericaceae | 8 |
| Oxypolis rigidior | (L.) Raf. | Apiaceae | 8 |
| Pachysandra procumbens | Michx. | Buxaceae | 8 |
| Packera anonyma | (Wood) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera aurea | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera glabella | (Poir.) C.Jeffrey | Asteraceae | 8 |
| Paepalanthus anceps | (Walter) Christenh. & Byng | Eriocaulaceae | 8 |
| Paepalanthus beyrichianus | (Sporl. ex Körn.) Christenh. & Byng | Eriocaulaceae | 8 |
| Palafoxia integrifolia | Torr. & A.Gray | Asteraceae | 8 |
| Palafoxia texana | DC. | Asteraceae | 8 |
| Palhinhaea cernua | (L.) Vasc. & Franco | Lycopodiaceae | 8 |
| Panicum amarum | Elliott | Poaceae | 8 |
| Panicum capillare | L. | Poaceae | 8 |
| Panicum dichotomiflorum | Michx. | Poaceae | 8 |
| Panicum flexile | (Gatt.) Scribn. | Poaceae | 8 |
| Panicum gymnocarpum | Elliott | Poaceae | 8 |
| Panicum hemitomon | Schult. | Poaceae | 8 |
| Panicum virgatum | L. | Poaceae | 8 |
| Parietaria floridana | Nutt. | Urticaceae | 8 |
| Parietaria pensylvanica | Muhl. ex Willd. | Urticaceae | 8 |
| Parietaria praetermissa | Hinton | Urticaceae | 8 |
| Parnassia caroliniana | Michx. | Celastraceae | 8 |
| Parnassia grandifolia | DC. | Celastraceae | 8 |
| Paronychia americana | (Nutt.) Fenzl ex Walp. | Caryophyllaceae | 8 |
| Paronychia baldwinii | (Torr. & A.Gray) Fenzl ex Walp. | Caryophyllaceae | 8 |
| Paronychia chartacea | Fernald | Caryophyllaceae | 8 |
| Paronychia erecta | (Chapm.) Shinners | Caryophyllaceae | 8 |
| Paronychia herniarioides | (Michx.) Nutt. | Caryophyllaceae | 8 |
| Paronychia patula | Shinners | Caryophyllaceae | 8 |
| Parthenocissus quinquefolia | (L.) Planch. | Vitaceae | 8 |
| Paspalum acuminatum | Raddi | Poaceae | 8 |
| Paspalum blodgettii | Chapm. | Poaceae | 8 |
| Paspalum conjugatum | P.J.Bergius | Poaceae | 8 |
| Paspalum denticulatum | Trin. | Poaceae | 8 |
| Paspalum distichum | L. | Poaceae | 8 |
| Paspalum floridanum | Michx. | Poaceae | 8 |
| Paspalum laeve | Michx. | Poaceae | 8 |
| Paspalum langei | (E.Fourn.) Nash | Poaceae | 8 |
| Paspalum monostachyum | Vasey ex Chapm. | Poaceae | 8 |
| Paspalum plicatulum | Michx. | Poaceae | 8 |
| Paspalum praecox | Walter | Poaceae | 8 |
| Paspalum pubiflorum | Rupr. ex E.Fourn. | Poaceae | 8 |
| Paspalum repens | P.J.Bergius | Poaceae | 8 |
| Paspalum setaceum | Michx. | Poaceae | 8 |
| Paspalum vaginatum | Sw. | Poaceae | 8 |
| Passiflora ciliata | Aiton | Passifloraceae | 8 |
| Passiflora incarnata | L. | Passifloraceae | 8 |
| Passiflora lutea | L. | Passifloraceae | 8 |
| Passiflora multiflora | L. | Passifloraceae | 8 |
| Passiflora pallida | L. | Passifloraceae | 8 |
| Passiflora sexflora | Juss. | Passifloraceae | 8 |
| Pectis glaucescens | (Cass.) D.J.Keil | Asteraceae | 8 |
| Pectis prostrata | Cav. | Asteraceae | 8 |
| Pedicularis canadensis | L. | Orobanchaceae | 8 |
| Pediomelum canescens | (Michx.) Rydb. | Fabaceae | 8 |
| Pelazoneuron kunthii | (Desv.) A.R.Sm. & S.E.Fawc. | Thelypteridaceae | 8 |
| Pelazoneuron ovatum | (R.P.St.John) A.R.Sm. & S.E.Fawc. | Thelypteridaceae | 8 |
| Pellaea atropurpurea | (L.) Link | Pteridaceae | 8 |
| Peltandra sagittifolia | (Michx.) Morong | Araceae | 8 |
| Peltandra virginica | (L.) Schott | Araceae | 8 |
| Penstemon australis | Small | Plantaginaceae | 8 |
| Penstemon laevigatus | Aiton | Plantaginaceae | 8 |
| Penstemon multiflorus | (Benth.) Chapm. ex Small | Plantaginaceae | 8 |
| Pentalinon berteroi | (A.DC.) J.F.Morales & M.E.Endress | Apocynaceae | 8 |
| Pentalinon luteum | (L.) B.F.Hansen & Wunderlin | Apocynaceae | 8 |
| Penthorum sedoides | L. | Penthoraceae | 8 |
| Peperomia emarginella | (Sw. ex Wikstr.) C.DC. | Piperaceae | 8 |
| Peperomia glabella | (Sw.) A.Dietr. | Piperaceae | 8 |
| Peperomia obtusifolia | (L.) A.Dietr. | Piperaceae | 8 |
| Peperomia pellucida | (L.) Kunth | Piperaceae | 8 |
| Persea borbonia | (L.) Spreng. | Lauraceae | 8 |
| Persicaria arifolia | (L.) Haraldson | Polygonaceae | 8 |
| Persicaria glabra | (Willd.) M.Gómez | Polygonaceae | 8 |
| Persicaria hirsuta | (Walter) Small | Polygonaceae | 8 |
| Persicaria hydropiperoides | (Michx.) Small | Polygonaceae | 8 |
| Persicaria lapathifolia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria pensylvanica | (L.) M.Gómez | Polygonaceae | 8 |
| Persicaria punctata | Small | Polygonaceae | 8 |
| Persicaria robustior | (Small) E.P.Bicknell | Polygonaceae | 8 |
| Persicaria sagittata | (L.) H.Gross | Polygonaceae | 8 |
| Persicaria setacea | Small | Polygonaceae | 8 |
| Persicaria virginiana | (L.) Gaertn. | Polygonaceae | 8 |
| Petiveria alliacea | L. | Petiveriaceae | 8 |
| Petrea volubilis | L. | Verbenaceae | 8 |
| Phalaris caroliniana | Walter | Poaceae | 8 |
| Pharus lappulaceus | Aubl. | Poaceae | 8 |
| Phaseolus polystachios | (L.) Britton, Sterns & Poggenb. | Fabaceae | 8 |
| Philadelphus inodorus | L. | Hydrangeaceae | 8 |
| Phlebodium aureum | (L.) J.Sm. | Polypodiaceae | 8 |
| Phlebodium pseudoaureum | (Cav.) Lellinger | Polypodiaceae | 8 |
| Phlox amoena | Sims | Polemoniaceae | 8 |
| Phlox carolina | L. | Polemoniaceae | 8 |
| Phlox divaricata | L. | Polemoniaceae | 8 |
| Phlox drummondii | Hook. | Polemoniaceae | 8 |
| Phlox glaberrima | L. | Polemoniaceae | 8 |
| Phlox nivalis | G.Lodd. ex Sweet | Polemoniaceae | 8 |
| Phlox pilosa | L. | Polemoniaceae | 8 |
| Phoebanthus grandiflorus | S.F.Blake | Asteraceae | 8 |
| Phoebanthus tenuifolius | S.F.Blake | Asteraceae | 8 |
| Phoradendron leucarpum | (Raf.) Reveal & M.C.Johnst. | Santalaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phryma leptostachya | L. | Phrymaceae | 8 |
| Phyla lanceolata | (Michx.) Greene | Verbenaceae | 8 |
| Phyla nodiflora | (L.) Greene | Verbenaceae | 8 |
| Phyllanthus abnormis | Baill. | Phyllanthaceae | 8 |
| Phyllanthus caroliniensis | Walter | Phyllanthaceae | 8 |
| Phyllanthus pentaphyllus | C.Wright ex Griseb. | Phyllanthaceae | 8 |
| Physalis angulata | L. | Solanaceae | 8 |
| Physalis angustifolia | Nutt. | Solanaceae | 8 |
| Physalis arenicola | Kearney | Solanaceae | 8 |
| Physalis cordata | Mill. | Solanaceae | 8 |
| Physalis grisea | (Waterf.) M.Martínez | Solanaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physalis pubescens | L. | Solanaceae | 8 |
| Physalis virginiana | Mill. | Solanaceae | 8 |
| Physalis walteri | Nutt. | Solanaceae | 8 |
| Physocarpus opulifolius | (L.) Maxim. | Rosaceae | 8 |
| Physostegia godfreyi | P.D.Cantino | Lamiaceae | 8 |
| Physostegia leptophylla | Small | Lamiaceae | 8 |
| Physostegia purpurea | (Walter) S.F.Blake | Lamiaceae | 8 |
| Physostegia virginiana | (L.) Benth. | Lamiaceae | 8 |
| Phytolacca americana | L. | Phytolaccaceae | 8 |
| Picramnia pentandra | Sw. | Picramniaceae | 8 |
| Pieris phillyreifolia | (Hook.) DC. | Ericaceae | 8 |
| Pilea fontana | (Lunell) Rydb. | Urticaceae | 8 |
| Pilea herniarioides | (Sw.) Lindl. | Urticaceae | 8 |
| Pilea microphylla | (L.) Liebm. | Urticaceae | 8 |
| Pilea pumila | A.Gray | Urticaceae | 8 |
| Piloblephis rigida | (W.Bartram ex Benth.) Raf. | Lamiaceae | 8 |
| Pilosocereus robinii | (Lem.) Byles & G.D.Rowley | Cactaceae | 8 |
| Pinguicula caerulea | Walter | Lentibulariaceae | 8 |
| Pinguicula ionantha | R.K.Godfrey | Lentibulariaceae | 8 |
| Pinguicula lutea | Walter | Lentibulariaceae | 8 |
| Pinguicula planifolia | Chapm. | Lentibulariaceae | 8 |
| Pinguicula primuliflora | C.E.Wood & R.K.Godfrey | Lentibulariaceae | 8 |
| Pinguicula pumila | Michx. | Lentibulariaceae | 8 |
| Pinus clausa | (Chapm. ex Engelm.) Vasey ex Sarg. | Pinaceae | 8 |
| Pinus echinata | Mill. | Pinaceae | 8 |
| Pinus elliottii | Engelm. | Pinaceae | 8 |
| Pinus glabra | Walter | Pinaceae | 8 |
| Pinus palustris | Mill. | Pinaceae | 8 |
| Pinus serotina | Michx. | Pinaceae | 8 |
| Pinus taeda | L. | Pinaceae | 8 |
| Piptochaetium avenaceum | (L.) Parodi | Poaceae | 8 |
| Piptochaetium avenacioides | (Nash) Valencia & Costas | Poaceae | 8 |
| Piriqueta cistoides | (L.) Griseb. | Passifloraceae | 8 |
| Piscidia piscipula | (L.) Sarg. | Fabaceae | 8 |
| Pisonia aculeata | L. | Nyctaginaceae | 8 |
| Pisonia rotundata | Griseb. | Nyctaginaceae | 8 |
| Pistia stratiotes | L. | Araceae | 8 |
| Pithecellobium keyense | Britton | Fabaceae | 8 |
| Pithecellobium unguis-cati | (L.) Benth. | Fabaceae | 8 |
| Pityopsis aspera | (A.Gray) Small | Asteraceae | 8 |
| Pityopsis graminifolia | (Michx.) Nutt. | Asteraceae | 8 |
| Pityrogramma trifoliata | (L.) R.M.Tryon | Pteridaceae | 8 |
| Planera aquatica | J.F.Gmel. | Ulmaceae | 8 |
| Planodes virginicum | (L.) Greene | Brassicaceae | 8 |
| Plantago aristata | Michx. | Plantaginaceae | 8 |
| Plantago cordata | Lam. | Plantaginaceae | 8 |
| Plantago heterophylla | Nutt. | Plantaginaceae | 8 |
| Plantago rugelii | Decne. | Plantaginaceae | 8 |
| Plantago sparsiflora | Michx. | Plantaginaceae | 8 |
| Plantago virginica | L. | Plantaginaceae | 8 |
| Plantago wrightiana | Decne. | Plantaginaceae | 8 |
| Platanthera blephariglottis | (Willd.) Lindl. | Orchidaceae | 8 |
| Platanthera chapmanii | (Small) Luer | Orchidaceae | 8 |
| Platanthera ciliaris | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera clavellata | (Michx.) Luer | Orchidaceae | 8 |
| Platanthera cristata | (Michx.) Lindl. | Orchidaceae | 8 |
| Platanthera flava | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera integra | (Nutt.) A.Gray ex L.C.Beck | Orchidaceae | 8 |
| Platanthera nivea | (Nutt.) Luer | Orchidaceae | 8 |
| Platanus occidentalis | L. | Platanaceae | 8 |
| Pleea tenuifolia | Michx. | Tofieldiaceae | 8 |
| Pleopeltis michauxiana | (Weath.) Hickey & Sprunt | Polypodiaceae | 8 |
| Pluchea baccharis | (Mill.) Pruski | Asteraceae | 8 |
| Pluchea foetida | (L.) DC. | Asteraceae | 8 |
| Pluchea odorata | (L.) Cass. | Asteraceae | 8 |
| Pluchea sagittalis | (Lam.) Cabrera | Asteraceae | 8 |
| Plumbago zeylanica | L. | Plumbaginaceae | 8 |
| Poa arachnifera | Torr. | Poaceae | 8 |
| Poa autumnalis | Muhl. ex Elliott | Poaceae | 8 |
| Poa pratensis | L. | Poaceae | 8 |
| Poa sylvestris | A.Gray | Poaceae | 8 |
| Podophyllum peltatum | L. | Berberidaceae | 8 |
| Pogonia ophioglossoides | (L.) Ker Gawl. | Orchidaceae | 8 |
| Polygonatum biflorum | (Walter) Elliott | Asparagaceae | 8 |
| Polygonella polygama | Engelm. & Gray | Polygonaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum glaucum | Nutt. | Polygonaceae | 8 |
| Polymnia laevigata | Beadle | Asteraceae | 8 |
| Polypremum procumbens | L. | Tetrachondraceae | 8 |
| Polystachya concreta | (Jacq.) Garay & H.R.Sweet | Orchidaceae | 8 |
| Polystichum acrostichoides | (Michx.) Schott | Dryopteridaceae | 8 |
| Pontederia cordata | L. | Pontederiaceae | 8 |
| Ponthieva racemosa | (Walter) C.Mohr | Orchidaceae | 8 |
| Populus deltoides | W.Bartram ex Marshall | Salicaceae | 8 |
| Populus heterophylla | L. | Salicaceae | 8 |
| Portulaca pilosa | L. | Portulacaceae | 8 |
| Portulaca rubricaulis | Kunth | Portulacaceae | 8 |
| Potamogeton berchtoldii | Fieber | Potamogetonaceae | 8 |
| Potamogeton diversifolius | Raf. | Potamogetonaceae | 8 |
| Potamogeton epihydrus | Raf. | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton illinoensis | Morong | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton perfoliatus | L. | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Primula meadia | (L.) A.R.Mast & Reveal | Primulaceae | 8 |
| Priva lappulacea | (L.) Pers. | Verbenaceae | 8 |
| Proboscidea louisianica | (Mill.) Thell. | Martyniaceae | 8 |
| Proserpinaca intermedia | Mack. | Haloragaceae | 8 |
| Proserpinaca palustris | L. | Haloragaceae | 8 |
| Proserpinaca pectinata | Lam. | Haloragaceae | 8 |
| Prosthechea boothiana | (Lindl.) W.E.Higgins | Orchidaceae | 8 |
| Prosthechea cochleata | (L.) W.E.Higgins | Orchidaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus americana | Marshall | Rosaceae | 8 |
| Prunus angustifolia | Marshall | Rosaceae | 8 |
| Prunus caroliniana | (Mill.) Aiton | Rosaceae | 8 |
| Prunus geniculata | R.M.Harper | Rosaceae | 8 |
| Prunus myrtifolia | (L.) Urb. | Rosaceae | 8 |
| Prunus serotina | Ehrh. | Rosaceae | 8 |
| Pseudolycopodiella caroliniana | (L.) Holub | Lycopodiaceae | 8 |
| Pseudophoenix sargentii | H.Wendl. ex Sarg. | Arecaceae | 8 |
| Psilotum nudum | (L.) P.Beauv. | Psilotaceae | 8 |
| Psychotria ligustrifolia | (Northr.) Millsp. | Rubiaceae | 8 |
| Psychotria nervosa | Sw. | Rubiaceae | 8 |
| Psychotria tenuifolia | Sw. | Rubiaceae | 8 |
| Ptelea trifoliata | L. | Rutaceae | 8 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Pteridium caudatum | (L.) Maxon | Dennstaedtiaceae | 8 |
| Pteris bahamensis | (J.Agardh) Fée | Pteridaceae | 8 |
| Pterocaulon pycnostachyum | Elliott | Asteraceae | 8 |
| Ptilimnium capillaceum | (Michx.) Raf. | Apiaceae | 8 |
| Pycnanthemum albescens | Torr. & A.Gray | Lamiaceae | 8 |
| Pycnanthemum flexuosum | (Walter) Britton, Sterns & Poggenb. | Lamiaceae | 8 |
| Pycnanthemum floridanum | E.Grant & Epling | Lamiaceae | 8 |
| Pycnanthemum incanum | (L.) Michx. | Lamiaceae | 8 |
| Pycnanthemum muticum | (Michx.) Pers. | Lamiaceae | 8 |
| Pycnanthemum nudum | Nutt. | Lamiaceae | 8 |
| Pyrrhopappus carolinianus | (Walter) DC. | Asteraceae | 8 |
| Quercus alba | L. | Fagaceae | 8 |
| Quercus arkansana | Sarg. | Fagaceae | 8 |
| Quercus austrina | Small | Fagaceae | 8 |
| Quercus chapmanii | Sarg. | Fagaceae | 8 |
| Quercus falcata | Michx. | Fagaceae | 8 |
| Quercus geminata | Small | Fagaceae | 8 |
| Quercus hemisphaerica | W.Bartram ex Willd. | Fagaceae | 8 |
| Quercus incana | W.Bartram | Fagaceae | 8 |
| Quercus inopina | Ashe | Fagaceae | 8 |
| Quercus laevis | Walter | Fagaceae | 8 |
| Quercus laurifolia | Michx. | Fagaceae | 8 |
| Quercus lyrata | Walter | Fagaceae | 8 |
| Quercus marilandica | (L.) Münchh. | Fagaceae | 8 |
| Quercus michauxii | Nutt. | Fagaceae | 8 |
| Quercus minima | (Sarg.) Small | Fagaceae | 8 |
| Quercus muehlenbergii | Engelm. | Fagaceae | 8 |
| Quercus myrtifolia | Willd. | Fagaceae | 8 |
| Quercus nigra | L. | Fagaceae | 8 |
| Quercus pagoda | Raf. | Fagaceae | 8 |
| Quercus phellos | L. | Fagaceae | 8 |
| Quercus pumila | Walter | Fagaceae | 8 |
| Quercus shumardii | Buckley | Fagaceae | 8 |
| Quercus similis | Ashe | Fagaceae | 8 |
| Quercus sinuata | Walter | Fagaceae | 8 |
| Quercus stellata | Wangenh. | Fagaceae | 8 |
| Quercus velutina | Lam. | Fagaceae | 8 |
| Quercus virginiana | Mill. | Fagaceae | 8 |
| Randia aculeata | L. | Rubiaceae | 8 |
| Ranunculus abortivus | L. | Ranunculaceae | 8 |
| Ranunculus carolinianus | DC. | Ranunculaceae | 8 |
| Ranunculus pusillus | Poir. | Ranunculaceae | 8 |
| Ranunculus recurvatus | Poir. | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ratibida pinnata | (Vent.) Barnhart | Asteraceae | 8 |
| Rayjacksonia phyllocephala | (DC.) R.L.Hartm. & M.A.Lane | Asteraceae | 8 |
| Restrepiella ophiocephala | (Lindl.) Garay & Dunst. | Orchidaceae | 8 |
| Reynosia septentrionalis | Urb. | Rhamnaceae | 8 |
| Rhabdadenia biflora | (Jacq.) Müll.Arg. | Apocynaceae | 8 |
| Rhapidophyllum hystrix | (Fraser ex Thouin) H.Wendl. & Drude | Arecaceae | 8 |
| Rhexia alifanus | Walter | Melastomataceae | 8 |
| Rhexia cubensis | Griseb. | Melastomataceae | 8 |
| Rhexia lutea | Walter | Melastomataceae | 8 |
| Rhexia mariana | L. | Melastomataceae | 8 |
| Rhexia nashii | Small | Melastomataceae | 8 |
| Rhexia nuttallii | C.W.James | Melastomataceae | 8 |
| Rhexia petiolata | Walter | Melastomataceae | 8 |
| Rhexia virginica | L. | Melastomataceae | 8 |
| Rhipsalis baccifera | (Sol. ex J.S.Muell.) Stearn | Cactaceae | 8 |
| Rhizophora mangle | L. | Rhizophoraceae | 8 |
| Rhododendron alabamense | Rehder | Ericaceae | 8 |
| Rhododendron austrinum | (Small) Rehder | Ericaceae | 8 |
| Rhododendron canescens | (Michx.) Sweet | Ericaceae | 8 |
| Rhododendron minus | Michx. | Ericaceae | 8 |
| Rhododendron viscosum | (L.) Torr. | Ericaceae | 8 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhus copallinum | L. | Anacardiaceae | 8 |
| Rhus glabra | L. | Anacardiaceae | 8 |
| Rhynchosia cinerea | Nash | Fabaceae | 8 |
| Rhynchosia cytisoides | (Bertol.) Wilbur | Fabaceae | 8 |
| Rhynchosia difformis | (Elliott) DC. | Fabaceae | 8 |
| Rhynchosia michauxii | Vail | Fabaceae | 8 |
| Rhynchosia minima | (L.) DC. | Fabaceae | 8 |
| Rhynchosia parvifolia | DC. | Fabaceae | 8 |
| Rhynchosia precatoria | (Humb. & Bonpl. ex Willd.) DC. | Fabaceae | 8 |
| Rhynchosia reniformis | DC. | Fabaceae | 8 |
| Rhynchosia tomentosa | (L.) Hook. & Arn. | Fabaceae | 8 |
| Rhynchospora baldwinii | A.Gray | Cyperaceae | 8 |
| Rhynchospora caduca | Elliott | Cyperaceae | 8 |
| Rhynchospora careyana | Fernald | Cyperaceae | 8 |
| Rhynchospora cephalantha | A.Gray | Cyperaceae | 8 |
| Rhynchospora chalarocephala | Fernald & Gale | Cyperaceae | 8 |
| Rhynchospora chapmanii | M.A.Curtis | Cyperaceae | 8 |
| Rhynchospora ciliaris | (Michx.) C.Mohr | Cyperaceae | 8 |
| Rhynchospora colorata | (L.) H.Pfeiff. | Cyperaceae | 8 |
| Rhynchospora compressa | J.Carey ex Chapm. | Cyperaceae | 8 |
| Rhynchospora corniculata | (Lam.) A.Gray | Cyperaceae | 8 |
| Rhynchospora crinipes | Gale | Cyperaceae | 8 |
| Rhynchospora divergens | Chapm. ex M.A.Curtis | Cyperaceae | 8 |
| Rhynchospora elliottii | A.Dietr. | Cyperaceae | 8 |
| Rhynchospora eximia | (Nees) Boeckeler | Cyperaceae | 8 |
| Rhynchospora fascicularis | (Michx.) Vahl | Cyperaceae | 8 |
| Rhynchospora fernaldii | Gale | Cyperaceae | 8 |
| Rhynchospora filifolia | A.Gray | Cyperaceae | 8 |
| Rhynchospora floridensis | (Britton ex Small) H.Pfeiff. | Cyperaceae | 8 |
| Rhynchospora galeana | Naczi, W.M.Knapp & G.Moor | Cyperaceae | 8 |
| Rhynchospora globularis | (Chapm.) Small | Cyperaceae | 8 |
| Rhynchospora glomerata | (L.) Vahl | Cyperaceae | 8 |
| Rhynchospora gracilenta | A.Gray | Cyperaceae | 8 |
| Rhynchospora grayi | Kunth | Cyperaceae | 8 |
| Rhynchospora harperi | Small | Cyperaceae | 8 |
| Rhynchospora harveyi | W.Boott | Cyperaceae | 8 |
| Rhynchospora inexpansa | (Michx.) Vahl | Cyperaceae | 8 |
| Rhynchospora intermedia | (Chapm.) Britton | Cyperaceae | 8 |
| Rhynchospora inundata | (Oakes) Fernald | Cyperaceae | 8 |
| Rhynchospora latifolia | (Baldwin ex Elliott) W.W.Thomas | Cyperaceae | 8 |
| Rhynchospora leptocarpa | (Chapm. ex Britton) Small | Cyperaceae | 8 |
| Rhynchospora macra | (C.B.Clarke ex Britton) Small | Cyperaceae | 8 |
| Rhynchospora macrostachya | Torr. ex A.Gray | Cyperaceae | 8 |
| Rhynchospora megalocarpa | A.Gray | Cyperaceae | 8 |
| Rhynchospora megaplumosa | E.L.Bridges & Orzell | Cyperaceae | 8 |
| Rhynchospora microcarpa | Baldwin ex A.Gray | Cyperaceae | 8 |
| Rhynchospora microcephala | (Britton) Britton | Cyperaceae | 8 |
| Rhynchospora miliacea | (Lam.) A.Gray | Cyperaceae | 8 |
| Rhynchospora mixta | Britton | Cyperaceae | 8 |
| Rhynchospora nitens | (Vahl) A.Gray | Cyperaceae | 8 |
| Rhynchospora odorata | C.Wright ex Griseb. | Cyperaceae | 8 |
| Rhynchospora oligantha | A.Gray | Cyperaceae | 8 |
| Rhynchospora pleiantha | (Kük.) Gale | Cyperaceae | 8 |
| Rhynchospora plumosa | Elliott | Cyperaceae | 8 |
| Rhynchospora rariflora | (Michx.) Elliott | Cyperaceae | 8 |
| Rhynchospora recognita | (Gale) Kral | Cyperaceae | 8 |
| Rhynchospora tracyi | Britton | Cyperaceae | 8 |
| Ribes echinellum | (Coville) Rehder | Grossulariaceae | 8 |
| Richardia scabra | L. | Rubiaceae | 8 |
| Rivina humilis | L. | Petiveriaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rorippa sessiliflora | (Nutt.) Hitchc. | Brassicaceae | 8 |
| Rorippa teres | (Michx.) Stuckey | Brassicaceae | 8 |
| Rosa carolina | L. | Rosaceae | 8 |
| Rosa palustris | Marshall | Rosaceae | 8 |
| Rosa setigera | Michx. | Rosaceae | 8 |
| Rotala ramosior | (L.) Koehne | Lythraceae | 8 |
| Rottboellia campestris | Nutt. | Poaceae | 8 |
| Rottboellia rugosa | Nutt. | Poaceae | 8 |
| Rottboellia tessellata | Steud. | Poaceae | 8 |
| Roystonea regia | (Kunth) O.F.Cook | Arecaceae | 8 |
| Rubus cuneifolius | Pursh | Rosaceae | 8 |
| Rubus flagellaris | Willd. | Rosaceae | 8 |
| Rubus trivialis | Michx. | Rosaceae | 8 |
| Rudbeckia amplexicaulis | Vahl | Asteraceae | 8 |
| Rudbeckia fulgida | Aiton | Asteraceae | 8 |
| Rudbeckia graminifolia | (Torr. & A.Gray) C.L.Boynton & Beadle | Asteraceae | 8 |
| Rudbeckia hirta | L. | Asteraceae | 8 |
| Rudbeckia laciniata | L. | Asteraceae | 8 |
| Rudbeckia triloba | L. | Asteraceae | 8 |
| Ruellia caroliniensis | (J.F.Gmel.) Steud. | Acanthaceae | 8 |
| Ruellia humilis | Nutt. | Acanthaceae | 8 |
| Ruellia noctiflora | (Nees) A.Gray | Acanthaceae | 8 |
| Ruellia pedunculata | Torr. ex A.Gray | Acanthaceae | 8 |
| Ruellia strepens | L. | Acanthaceae | 8 |
| Rumex altissimus | Alph.Wood | Polygonaceae | 8 |
| Rumex hastatulus | Baldwin | Polygonaceae | 8 |
| Rumex verticillatus | L. | Polygonaceae | 8 |
| Rumohra adiantiformis | (G.Forst.) Ching | Dryopteridaceae | 8 |
| Ruppia maritima | L. | Ruppiaceae | 8 |
| Sabal minor | (Jacq.) Pers. | Arecaceae | 8 |
| Sabal palmetto | (Walter) Lodd. ex Schult. & Schult.f. | Arecaceae | 8 |
| Sabatia angularis | (L.) Pursh | Gentianaceae | 8 |
| Sabatia brevifolia | Raf. | Gentianaceae | 8 |
| Sabatia calycina | (Lam.) A.Heller | Gentianaceae | 8 |
| Sabatia campanulata | (L.) Torr. | Gentianaceae | 8 |
| Sabatia decandra | (Walter) R.M.Harper | Gentianaceae | 8 |
| Sabatia difformis | (L.) Druce | Gentianaceae | 8 |
| Sabatia gentianoides | Elliott | Gentianaceae | 8 |
| Sabatia grandiflora | (A.Gray) Small | Gentianaceae | 8 |
| Sabatia macrophylla | Hook. | Gentianaceae | 8 |
| Sabatia quadrangula | Wilbur | Gentianaceae | 8 |
| Sabatia stellaris | Pursh | Gentianaceae | 8 |
| Sabdariffa aculeata | (Walter) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Sabdariffa furcellata | (Desr.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Sacciolepis striata | (L.) Nash | Poaceae | 8 |
| Sacoila lanceolata | (Aubl.) Garay | Orchidaceae | 8 |
| Sagina decumbens | (Elliott) Torr. & A.Gray | Caryophyllaceae | 8 |
| Sagittaria australis | (J.G.Sm.) Small | Alismataceae | 8 |
| Sagittaria chapmanii | (J.G.Sm.) C.Mohr | Alismataceae | 8 |
| Sagittaria engelmanniana | J.G.Sm. | Alismataceae | 8 |
| Sagittaria graminea | Michx. | Alismataceae | 8 |
| Sagittaria lancifolia | L. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Sagittaria platyphylla | (Engelm.) J.G.Sm. | Alismataceae | 8 |
| Salicornia bigelovii | Torr. | Chenopodiaceae | 8 |
| Salicornia pacifica | Standl. | Chenopodiaceae | 8 |
| Salix caroliniana | Michx. | Salicaceae | 8 |
| Salix eriocephala | Michx. | Salicaceae | 8 |
| Salix humilis | Marshall | Salicaceae | 8 |
| Salix nigra | Marshall | Salicaceae | 8 |
| Salvia azurea | Lam. ex Vahl | Lamiaceae | 8 |
| Salvia coccinea | Buc'hoz ex Etl. | Lamiaceae | 8 |
| Salvia lyrata | L. | Lamiaceae | 8 |
| Salvia misella | Kunth | Lamiaceae | 8 |
| Salvia occidentalis | Sw. | Lamiaceae | 8 |
| Sambucus canadensis | L. | Viburnaceae | 8 |
| Samolus ebracteatus | Kunth | Primulaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguinaria canadensis | L. | Papaveraceae | 8 |
| Sanicula canadensis | L. | Apiaceae | 8 |
| Sanicula marilandica | L. | Apiaceae | 8 |
| Sanicula odorata | (Raf.) K.M.Pryer & L.R.Phillippe | Apiaceae | 8 |
| Sanicula smallii | E.P.Bicknell | Apiaceae | 8 |
| Sapindus saponaria | L. | Sapindaceae | 8 |
| Sarracenia flava | L. | Sarraceniaceae | 8 |
| Sarracenia leucophylla | Raf. | Sarraceniaceae | 8 |
| Sarracenia minor | Walter | Sarraceniaceae | 8 |
| Sarracenia psittacina | Michx. | Sarraceniaceae | 8 |
| Sarracenia rosea | Naczi, F.W.Case & R.B.Case | Sarraceniaceae | 8 |
| Sarracenia rubra | Walter | Sarraceniaceae | 8 |
| Sassafras albidum | (Nutt.) Nees | Lauraceae | 8 |
| Saururus cernuus | L. | Saururaceae | 8 |
| Scaevola plumieri | (L.) Vahl | Goodeniaceae | 8 |
| Sceptridium biternatum | (Savigny) Lyon | Ophioglossaceae | 8 |
| Sceptridium dissectum | (Spreng.) Lyon | Ophioglossaceae | 8 |
| Sceptridium lunarioides | (Michx.) Holub | Ophioglossaceae | 8 |
| Schisandra glabra | (Brickell) Rehder | Schisandraceae | 8 |
| Schizachne purpurascens | (Torr.) Swallen | Poaceae | 8 |
| Schizachyrium gracile | (Spreng.) Nash | Poaceae | 8 |
| Schizachyrium littorale | (Nash) E.P.Bicknell | Poaceae | 8 |
| Schizachyrium maritimum | (Chapm.) Nash | Poaceae | 8 |
| Schizachyrium niveum | (Swallen) Gould | Poaceae | 8 |
| Schizachyrium rhizomatum | (Swallen) Gould | Poaceae | 8 |
| Schizachyrium sanguineum | (Retz.) Alston | Poaceae | 8 |
| Schizachyrium scoparium | (Michx.) Nash | Poaceae | 8 |
| Schoenocaulon dubium | (Michx.) Small | Melanthiaceae | 8 |
| Schoenolirion albiflorum | (Raf.) R.R.Gates | Asparagaceae | 8 |
| Schoenolirion croceum | (Michx.) Alph.Wood | Asparagaceae | 8 |
| Schoenoplectus americanus | (Pers.) Volkart | Cyperaceae | 8 |
| Schoenoplectus californicus | (C.A.Mey.) Soják | Cyperaceae | 8 |
| Schoenoplectus etuberculatus | (Steud.) Soják | Cyperaceae | 8 |
| Schoenoplectus pungens | (Vahl) Palla | Cyperaceae | 8 |
| Schoenoplectus subterminalis | (Torr.) Soják | Cyperaceae | 8 |
| Schoenoplectus tabernaemontani | (C.C.Gmel.) Palla | Cyperaceae | 8 |
| Schoenus nigricans | L. | Cyperaceae | 8 |
| Schoepfia schreberi | J.F.Gmel. | Schoepfiaceae | 8 |
| Schwalbea americana | L. | Orobanchaceae | 8 |
| Scirpus cyperinus | (L.) Kunth | Cyperaceae | 8 |
| Scirpus lineatus | Michx. | Cyperaceae | 8 |
| Scirpus pendulus | Muhl. | Cyperaceae | 8 |
| Scleria baldwinii | (Torr.) Steud. | Cyperaceae | 8 |
| Scleria ciliata | Michx. | Cyperaceae | 8 |
| Scleria distans | Poir. | Cyperaceae | 8 |
| Scleria georgiana | Core | Cyperaceae | 8 |
| Scleria muehlenbergii | Steud. | Cyperaceae | 8 |
| Scleria oligantha | Michx. | Cyperaceae | 8 |
| Scleria pauciflora | Muhl. ex Willd. | Cyperaceae | 8 |
| Scleria triglomerata | Michx. | Cyperaceae | 8 |
| Scleria verticillata | Muhl. ex Willd. | Cyperaceae | 8 |
| Sclerolepis uniflora | (Walter) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Scoparia dulcis | L. | Plantaginaceae | 8 |
| Scrophularia marilandica | L. | Scrophulariaceae | 8 |
| Scutellaria arenicola | Small | Lamiaceae | 8 |
| Scutellaria elliptica | Muhl. | Lamiaceae | 8 |
| Scutellaria galericulata | L. | Lamiaceae | 8 |
| Scutellaria incana | Biehler | Lamiaceae | 8 |
| Scutellaria integrifolia | L. | Lamiaceae | 8 |
| Scutellaria lateriflora | L. | Lamiaceae | 8 |
| Scutellaria multiglandulosa | (Kearney) Small ex Harper | Lamiaceae | 8 |
| Scutellaria parvula | Michx. | Lamiaceae | 8 |
| Scutellaria racemosa | Pers. | Lamiaceae | 8 |
| Selaginella acanthonota | Underw. | Selaginellaceae | 8 |
| Selaginella apoda | Spring | Selaginellaceae | 8 |
| Selaginella arenicola | Underw. | Selaginellaceae | 8 |
| Selaginella ludoviciana | A.Braun | Selaginellaceae | 8 |
| Senna ligustrina | (L.) H.S.Irwin & Barneby | Fabaceae | 8 |
| Senna marilandica | (L.) Link | Fabaceae | 8 |
| Senna mexicana | (Jacq.) H.S.Irwin & Barneby | Fabaceae | 8 |
| Senna obtusifolia | (L.) H.S.Irwin & Barneby | Fabaceae | 8 |
| Serenoa repens | (W.Bartram) Small | Arecaceae | 8 |
| Sericocarpus caespitosus | G.L.Nesom | Asteraceae | 8 |
| Sericocarpus tortifolius | Nees | Asteraceae | 8 |
| Serpocaulon triseriale | (Sw.) A.R.Sm. | Polypodiaceae | 8 |
| Sesbania herbacea | (Mill.) McVaugh | Fabaceae | 8 |
| Sesbania vesicaria | (Jacq.) Elliott | Fabaceae | 8 |
| Sesuvium maritimum | (Walter) Britton, Sterns & Poggenb. | Aizoaceae | 8 |
| Sesuvium portulacastrum | (L.) L. | Aizoaceae | 8 |
| Setaria corrugata | (Elliott) Schult. | Poaceae | 8 |
| Setaria leucopila | (Scribn. & Merr.) K.Schum. | Poaceae | 8 |
| Setaria magna | Griseb. | Poaceae | 8 |
| Setaria parviflora | (Poir.) Kerguélen | Poaceae | 8 |
| Setaria reverchonii | (Vasey) Pilg. | Poaceae | 8 |
| Seymeria cassioides | (J.F.Gmel.) S.F.Blake | Orobanchaceae | 8 |
| Seymeria pectinata | Pursh | Orobanchaceae | 8 |
| Sida ciliaris | L. | Malvaceae | 8 |
| Sida cordifolia | L. | Malvaceae | 8 |
| Sida elliottii | Torr. & A.Gray | Malvaceae | 8 |
| Sida spinosa | L. | Malvaceae | 8 |
| Sida ulmifolia | Mill. | Malvaceae | 8 |
| Sideroxylon celastrinum | (Kunth) T.D.Penn. | Sapotaceae | 8 |
| Sideroxylon foetidissimum | Jacq. | Sapotaceae | 8 |
| Sideroxylon lanuginosum | Michx. | Sapotaceae | 8 |
| Sideroxylon lycioides | L. | Sapotaceae | 8 |
| Sideroxylon reclinatum | Michx. | Sapotaceae | 8 |
| Sideroxylon rufohirtum | Herring & Judd | Sapotaceae | 8 |
| Sideroxylon salicifolium | (L.) Lam. | Sapotaceae | 8 |
| Sideroxylon tenax | L. | Sapotaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene virginica | L. | Caryophyllaceae | 8 |
| Silphium asteriscus | L. | Asteraceae | 8 |
| Silphium compositum | Michx. | Asteraceae | 8 |
| Simarouba glauca | DC. | Simaroubaceae | 8 |
| Sisyrinchium albidum | Raf. | Iridaceae | 8 |
| Sisyrinchium angustifolium | Mill. | Iridaceae | 8 |
| Sisyrinchium atlanticum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium fuscatum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium miamiense | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium nashii | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium xerophyllum | Greene | Iridaceae | 8 |
| Sium suave | Walter | Apiaceae | 8 |
| Smallanthus uvedalia | (L.) Mack. | Asteraceae | 8 |
| Smilax auriculata | Walter | Smilacaceae | 8 |
| Smilax biltmoreana | (Small) J.B.Norton ex Pennell | Smilacaceae | 8 |
| Smilax bona-nox | L. | Smilacaceae | 8 |
| Smilax glauca | Walter | Smilacaceae | 8 |
| Smilax havanensis | Jacq. | Smilacaceae | 8 |
| Smilax hugeri | (Small) J.B.Norton ex Pennell | Smilacaceae | 8 |
| Smilax laurifolia | L. | Smilacaceae | 8 |
| Smilax maritima | Feay ex Alph.Wood | Smilacaceae | 8 |
| Smilax pumila | Walter | Smilacaceae | 8 |
| Smilax rotundifolia | L. | Smilacaceae | 8 |
| Smilax tamnoides | L. | Smilacaceae | 8 |
| Smilax walteri | Pursh | Smilacaceae | 8 |
| Solanum americanum | Mill. | Solanaceae | 8 |
| Solanum bahamense | L. | Solanaceae | 8 |
| Solanum carolinense | L. | Solanaceae | 8 |
| Solanum donianum | Walp. | Solanaceae | 8 |
| Solanum emulans | Raf. | Solanaceae | 8 |
| Solanum erianthum | D.Don | Solanaceae | 8 |
| Solanum nigrescens | M.Martens & Galeotti | Solanaceae | 8 |
| Solanum pseudogracile | Heiser | Solanaceae | 8 |
| Solanum rostratum | Dunal | Solanaceae | 8 |
| Solidago altissima | L. | Asteraceae | 8 |
| Solidago arguta | Aiton | Asteraceae | 8 |
| Solidago auriculata | Shuttlew. ex S.F.Blake | Asteraceae | 8 |
| Solidago caesia | L. | Asteraceae | 8 |
| Solidago fistulosa | Mill. | Asteraceae | 8 |
| Solidago gigantea | Aiton | Asteraceae | 8 |
| Solidago latissimifolia | Mill. | Asteraceae | 8 |
| Solidago leavenworthii | Torr. & A.Gray | Asteraceae | 8 |
| Solidago mexicana | L. | Asteraceae | 8 |
| Solidago nemoralis | Aiton | Asteraceae | 8 |
| Solidago odora | Aiton | Asteraceae | 8 |
| Solidago patula | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago petiolaris | Aiton | Asteraceae | 8 |
| Solidago puberula | Nutt. | Asteraceae | 8 |
| Solidago rugosa | Mill. | Asteraceae | 8 |
| Solidago tortifolia | Elliott | Asteraceae | 8 |
| Solidago ulmifolia | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago virgata | Michx. | Asteraceae | 8 |
| Sophora tomentosa | L. | Fabaceae | 8 |
| Sorghastrum elliottii | (C.Mohr) Nash | Poaceae | 8 |
| Sorghastrum nutans | (L.) Nash | Poaceae | 8 |
| Sorghastrum secundum | (Elliott) Nash | Poaceae | 8 |
| Sparganium americanum | Nutt. | Typhaceae | 8 |
| Spergularia marina | (L.) Besser | Caryophyllaceae | 8 |
| Spermacoce confusa | Rendle | Rubiaceae | 8 |
| Spermacoce glabra | Michx. | Rubiaceae | 8 |
| Spermacoce neoterminalis | Govaerts | Rubiaceae | 8 |
| Spermacoce prostrata | Aubl. | Rubiaceae | 8 |
| Spermacoce remota | Lam. | Rubiaceae | 8 |
| Spermacoce verticillata | L. | Rubiaceae | 8 |
| Sphenopholis filiformis | (Chapm.) Scribn. | Poaceae | 8 |
| Sphenopholis intermedia | (Rydb.) Rydb. | Poaceae | 8 |
| Sphenopholis nitida | (Biehler) Scribn. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 8 |
| Sphenopholis pensylvanica | (L.) Hitchc. | Poaceae | 8 |
| Spigelia anthelmia | L. | Loganiaceae | 8 |
| Spigelia marilandica | (L.) L. | Loganiaceae | 8 |
| Spiranthes cernua | (L.) Rich. | Orchidaceae | 8 |
| Spiranthes lacera | (Raf.) Raf. | Orchidaceae | 8 |
| Spiranthes laciniata | (Small) Ames | Orchidaceae | 8 |
| Spiranthes longilabris | Lindl. | Orchidaceae | 8 |
| Spiranthes odorata | (Nutt.) Lindl. | Orchidaceae | 8 |
| Spiranthes ovalis | Lindl. | Orchidaceae | 8 |
| Spiranthes praecox | (Walter) S.Watson | Orchidaceae | 8 |
| Spiranthes sylvatica | P.M.Br. | Orchidaceae | 8 |
| Spiranthes torta | (Thunb.) Garay & H.R.Sweet | Orchidaceae | 8 |
| Spiranthes triloba | (Small) K.Schum. | Orchidaceae | 8 |
| Spiranthes tuberosa | Raf. | Orchidaceae | 8 |
| Spiranthes vernalis | Engelm. & A.Gray | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus alterniflorus | (Loisel.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus bakeri | (Merr.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus clandestinus | (Biehler) Hitchc. | Poaceae | 8 |
| Sporobolus compositus | (Poir.) Merr. | Poaceae | 8 |
| Sporobolus curtissii | Small ex Kearney | Poaceae | 8 |
| Sporobolus cynosuroides | (L.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus floridanus | Chapm. | Poaceae | 8 |
| Sporobolus indicus | (L.) R.Br. | Poaceae | 8 |
| Sporobolus junceus | (P.Beauv.) Kunth | Poaceae | 8 |
| Sporobolus pumilus | (Roth) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus pyramidatus | (Lam.) Hitchc. | Poaceae | 8 |
| Sporobolus vaginiflorus | (Torr. ex A.Gray) Alph.Wood | Poaceae | 8 |
| Stachydeoma graveolens | (Chapm. ex A.Gray) Small | Lamiaceae | 8 |
| Stachys aspera | Michx. | Lamiaceae | 8 |
| Stachys floridana | Shuttlew. ex Benth. | Lamiaceae | 8 |
| Stachytarpheta jamaicensis | (L.) Vahl | Verbenaceae | 8 |
| Staphylea trifolia | L. | Staphyleaceae | 8 |
| Steinchisma hians | (Elliott) Nash | Poaceae | 8 |
| Stellaria cuspidata | D.F.K.Schltdl. | Caryophyllaceae | 8 |
| Stellaria pubera | Michx. | Caryophyllaceae | 8 |
| Stenandrium dulce | (Cav.) Nees | Acanthaceae | 8 |
| Stenanthium densum | (Desr.) Zomlefer & Judd | Melanthiaceae | 8 |
| Stenanthium gramineum | (Ker Gawl.) Morong | Melanthiaceae | 8 |
| Stenanthium texanum | (Bush) Sorrie & Weakley | Melanthiaceae | 8 |
| Stenaria nigricans | (Lam.) Terrell | Rubiaceae | 8 |
| Stenotaphrum secundatum | (Walter) Kuntze | Poaceae | 8 |
| Sterculia apetala | (Jacq.) H.Karst. | Malvaceae | 8 |
| Stewartia malacodendron | L. | Theaceae | 8 |
| Stillingia aquatica | Chapm. | Euphorbiaceae | 8 |
| Stillingia sylvatica | L. | Euphorbiaceae | 8 |
| Stillingia tenuis | Small | Euphorbiaceae | 8 |
| Stipulicida setacea | Michx. | Caryophyllaceae | 8 |
| Stokesia laevis | (Hill) Greene | Asteraceae | 8 |
| Strophostyles umbellata | (Muhl. ex Willd.) Britton | Fabaceae | 8 |
| Strumpfia maritima | Jacq. | Rubiaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Stylisma abdita | Myint | Convolvulaceae | 8 |
| Stylisma humistrata | (Walter) Chapm. | Convolvulaceae | 8 |
| Stylisma patens | (Desr.) Myint | Convolvulaceae | 8 |
| Stylisma villosa | (Nash) House | Convolvulaceae | 8 |
| Stylosanthes biflora | (L.) Britton, Sterns & Poggenb. | Fabaceae | 8 |
| Styrax americanus | Lam. | Styracaceae | 8 |
| Styrax grandifolius | Aiton | Styracaceae | 8 |
| Suaeda linearis | (Elliott) Moq. | Chenopodiaceae | 8 |
| Suriana maritima | L. | Surianaceae | 8 |
| Swietenia mahagoni | (L.) Jacq. | Meliaceae | 8 |
| Symphoricarpos orbiculatus | Moench | Caprifoliaceae | 8 |
| Symphyotrichum adnatum | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum concolor | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum dumosum | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum elliottii | (Torr. & A.Gray) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum fontinale | (Alexander) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum georgianum | (Alexander) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum laeve | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum lanceolatum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum patens | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum pilosum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum plumosum | (Small) Semple | Asteraceae | 8 |
| Symphyotrichum praealtum | (Poir.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum pratense | (Raf.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum racemosum | (Elliott) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum shortii | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum simmondsii | (Small) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum tenuifolium | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum undulatum | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum urophyllum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum walteri | (Alexander) G.L.Nesom | Asteraceae | 8 |
| Symplocos tinctoria | (L.) L'Hér. | Symplocaceae | 8 |
| Syngonanthus flavidulus | (Michx.) Ruhland | Eriocaulaceae | 8 |
| Syringodium filiforme | Kütz. | Cymodoceaceae | 8 |
| Talinum fruticosum | (L.) Juss. | Talinaceae | 8 |
| Taxodium distichum | (L.) Rich. | Cupressaceae | 8 |
| Taxus floridana | Nutt. ex Chapm. | Taxaceae | 8 |
| Tecoma stans | (L.) Juss. | Bignoniaceae | 8 |
| Tectaria heracleifolia | (Willd.) Underw. | Tectariaceae | 8 |
| Telmatoblechnum serrulatum | (Rich.) Perrie, D.J.Ohlsen & Brownsey | Blechnaceae | 8 |
| Tephrosia chrysophylla | Pursh | Fabaceae | 8 |
| Tephrosia florida | (F.Dietr.) C.E.Wood | Fabaceae | 8 |
| Tephrosia mysteriosa | DeLaney | Fabaceae | 8 |
| Tephrosia rugelii | Shuttlew. ex B.L.Rob. | Fabaceae | 8 |
| Tephrosia virginiana | (L.) Pers. | Fabaceae | 8 |
| Tetragonotheca helianthoides | L. | Asteraceae | 8 |
| Teucrium canadense | L. | Lamiaceae | 8 |
| Thalassia testudinum | Banks & Sol. ex K.D.Koenig | Hydrocharitaceae | 8 |
| Thalia geniculata | L. | Marantaceae | 8 |
| Thalictrum cooleyi | H.E.Ahles | Ranunculaceae | 8 |
| Thalictrum revolutum | DC. | Ranunculaceae | 8 |
| Thaspium barbinode | (Michx.) Nutt. | Apiaceae | 8 |
| Thaspium chapmanii | (J.M.Coult. & Rose) Small | Apiaceae | 8 |
| Thaspium trifoliatum | (L.) A.Gray | Apiaceae | 8 |
| Thelypteris palustris | Schott | Thelypteridaceae | 8 |
| Thrinax radiata | Lodd. ex Schult. & Schult.f. | Arecaceae | 8 |
| Thymophylla tenuiloba | Small | Asteraceae | 8 |
| Thyrsanthella difformis | (Walter) Pichon | Apocynaceae | 8 |
| Tiedemannia filiformis | (Walter) M.A.Feist & S.R.Downie | Apiaceae | 8 |
| Tilia americana | L. | Malvaceae | 8 |
| Tillandsia balbisiana | Schult. & Schult.f. | Bromeliaceae | 8 |
| Tillandsia bartramii | Elliott | Bromeliaceae | 8 |
| Tillandsia fasciculata | Sw. | Bromeliaceae | 8 |
| Tillandsia flexuosa | Sw. | Bromeliaceae | 8 |
| Tillandsia paucifolia | Baker | Bromeliaceae | 8 |
| Tillandsia pruinosa | Sw. | Bromeliaceae | 8 |
| Tillandsia recurvata | (L.) L. | Bromeliaceae | 8 |
| Tillandsia setacea | Sw. | Bromeliaceae | 8 |
| Tillandsia simulata | Small | Bromeliaceae | 8 |
| Tillandsia usneoides | (L.) L. | Bromeliaceae | 8 |
| Tillandsia utriculata | L. | Bromeliaceae | 8 |
| Tillandsia variabilis | Schltdl. | Bromeliaceae | 8 |
| Tipularia discolor | (Pursh) Nutt. | Orchidaceae | 8 |
| Tomostima cuneifolia | (Nutt. ex Torr. & A.Gray) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Torreya taxifolia | Arn. | Taxaceae | 8 |
| Tournefortia gnaphalodes | (L.) Roem. & Schult. | Heliotropiaceae | 8 |
| Toxicodendron pubescens | Mill. | Anacardiaceae | 8 |
| Toxicodendron radicans | (L.) Kuntze | Anacardiaceae | 8 |
| Toxicodendron vernix | Kuntze | Anacardiaceae | 8 |
| Tradescantia hirsutiflora | Bush | Commelinaceae | 8 |
| Tradescantia ohiensis | Raf. | Commelinaceae | 8 |
| Tradescantia roseolens | Small | Commelinaceae | 8 |
| Tradescantia subaspera | Ker Gawl. | Commelinaceae | 8 |
| Tragia cordata | Michx. | Euphorbiaceae | 8 |
| Tragia smallii | Shinners | Euphorbiaceae | 8 |
| Tragia urens | L. | Euphorbiaceae | 8 |
| Tragia urticifolia | Michx. | Euphorbiaceae | 8 |
| Trema micranthum | (L.) Blume | Cannabaceae | 8 |
| Trepocarpus aethusae | Nutt. ex DC. | Apiaceae | 8 |
| Triantha racemosa | (Walter) Small | Tofieldiaceae | 8 |
| Trianthema portulacastrum | L. | Aizoaceae | 8 |
| Trichogalium bermudense | (L.) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichostema dichotomum | L. | Lamiaceae | 8 |
| Trichostema setaceum | Houtt. | Lamiaceae | 8 |
| Trichostema suffrutescens | Kearney | Lamiaceae | 8 |
| Trichostigma octandrum | (L.) H.Walter | Petiveriaceae | 8 |
| Tridens ambiguus | (Elliott) Schult. | Poaceae | 8 |
| Tridens chapmanii | (Small) Chase | Poaceae | 8 |
| Tridens flavus | (L.) Hitchc. | Poaceae | 8 |
| Tridens strictus | (Nutt.) Nash | Poaceae | 8 |
| Trifolium reflexum | L. | Fabaceae | 8 |
| Triglochin striata | Ruiz & Pav. | Juncaginaceae | 8 |
| Trilisa paniculata | Cass. | Asteraceae | 8 |
| Trillium decipiens | J.D.Freeman | Melanthiaceae | 8 |
| Trillium lancifolium | Raf. | Melanthiaceae | 8 |
| Trillium maculatum | Raf. | Melanthiaceae | 8 |
| Trillium underwoodii | Small | Melanthiaceae | 8 |
| Triodanis perfoliata | (L.) Nieuwl. | Campanulaceae | 8 |
| Triphora gentianoides | (Sw.) Nutt. ex Ames & Schltr. | Orchidaceae | 8 |
| Triphora trianthophoros | (Sw.) Rydb. | Orchidaceae | 8 |
| Triplasiella eragrostoides | (Vasey & Scribn.) P.M.Peterson & Romasch. | Poaceae | 8 |
| Triplasis americana | P.Beauv. | Poaceae | 8 |
| Triplasis purpurea | (Walter) Chapm. | Poaceae | 8 |
| Tripsacum dactyloides | (L.) L. | Poaceae | 8 |
| Triumfetta semitriloba | Jacq. | Malvaceae | 8 |
| Typha domingensis | Pers. | Typhaceae | 8 |
| Typha latifolia | L. | Typhaceae | 8 |
| Ulmus alata | Michx. | Ulmaceae | 8 |
| Ulmus americana | L. | Ulmaceae | 8 |
| Ulmus crassifolia | Nutt. | Ulmaceae | 8 |
| Ulmus rubra | Muhl. | Ulmaceae | 8 |
| Uniola paniculata | L. | Poaceae | 8 |
| Urochloa arizonica | (Scribn. & Merr.) Morrone & Zuloaga | Poaceae | 8 |
| Urochloa platyphylla | (Munro ex C.Wright) R.D.Webster | Poaceae | 8 |
| Urtica chamaedryoides | Pursh | Urticaceae | 8 |
| Utricularia cornuta | Michx. | Lentibulariaceae | 8 |
| Utricularia foliosa | L. | Lentibulariaceae | 8 |
| Utricularia gibba | L. | Lentibulariaceae | 8 |
| Utricularia inflata | Walter | Lentibulariaceae | 8 |
| Utricularia juncea | Vahl | Lentibulariaceae | 8 |
| Utricularia macrorhiza | Leconte | Lentibulariaceae | 8 |
| Utricularia purpurea | Walter | Lentibulariaceae | 8 |
| Utricularia radiata | Small | Lentibulariaceae | 8 |
| Utricularia resupinata | B.D.Greene ex Bigelow | Lentibulariaceae | 8 |
| Utricularia simulans | Pilg. | Lentibulariaceae | 8 |
| Utricularia striata | Leconte ex Torr. | Lentibulariaceae | 8 |
| Utricularia subulata | L. | Lentibulariaceae | 8 |
| Uvularia floridana | Chapm. | Colchicaceae | 8 |
| Uvularia perfoliata | L. | Colchicaceae | 8 |
| Uvularia sessilifolia | L. | Colchicaceae | 8 |
| Vaccinium arboreum | Marshall | Ericaceae | 8 |
| Vaccinium corymbosum | L. | Ericaceae | 8 |
| Vaccinium darrowii | Camp | Ericaceae | 8 |
| Vaccinium myrsinites | Lam. | Ericaceae | 8 |
| Vaccinium stamineum | L. | Ericaceae | 8 |
| Vaccinium tenellum | Aiton | Ericaceae | 8 |
| Vachellia choriophylla | (Benth.) Seigler & Ebinger | Fabaceae | 8 |
| Vachellia farnesiana | (L.) Wight & Arn. | Fabaceae | 8 |
| Valeriana scandens | L. | Caprifoliaceae | 8 |
| Vanilla phaeantha | Rchb.f. | Orchidaceae | 8 |
| Verbena bracteata | Cav. ex Lag. & Rodr. | Verbenaceae | 8 |
| Verbena canadensis | (L.) Britton | Verbenaceae | 8 |
| Verbena carnea | Medik. | Verbenaceae | 8 |
| Verbena halei | Small | Verbenaceae | 8 |
| Verbena hastata | L. | Verbenaceae | 8 |
| Verbena maritima | Small | Verbenaceae | 8 |
| Verbena neomexicana | (A.Gray) Briq. | Verbenaceae | 8 |
| Verbena scabra | Vahl | Verbenaceae | 8 |
| Verbena urticifolia | L. | Verbenaceae | 8 |
| Verbesina alternifolia | (L.) Britton ex Kearney | Asteraceae | 8 |
| Verbesina chapmanii | J.R.Coleman | Asteraceae | 8 |
| Verbesina occidentalis | Walter | Asteraceae | 8 |
| Verbesina virginica | L. | Asteraceae | 8 |
| Vernonia acaulis | Walt. | Asteraceae | 8 |
| Vernonia blodgettii | Small | Asteraceae | 8 |
| Vernonia gigantea | (Walter) Trel. | Asteraceae | 8 |
| Vernonia noveboracensis | (L.) Michx. | Asteraceae | 8 |
| Veronica peregrina | L. | Plantaginaceae | 8 |
| Veronicastrum virginicum | (L.) Farw. | Plantaginaceae | 8 |
| Viburnum acerifolium | L. | Viburnaceae | 8 |
| Viburnum cassinoides | L. | Viburnaceae | 8 |
| Viburnum nudum | L. | Viburnaceae | 8 |
| Viburnum obovatum | Walter | Viburnaceae | 8 |
| Viburnum recognitum | Fernald | Viburnaceae | 8 |
| Viburnum rufidulum | Raf. | Viburnaceae | 8 |
| Viburnum scabrellum | (Torr. & A.Gray) Chapm. | Viburnaceae | 8 |
| Vicia acutifolia | Elliott | Fabaceae | 8 |
| Vicia caroliniana | Walter | Fabaceae | 8 |
| Vicia floridana | S.Watson | Fabaceae | 8 |
| Vicia minutiflora | D.Dietr. | Fabaceae | 8 |
| Vigna luteola | (Jacq.) Benth. | Fabaceae | 8 |
| Viola affinis | Leconte | Violaceae | 8 |
| Viola hastata | Michx. | Violaceae | 8 |
| Viola hirsutula | Brainerd | Violaceae | 8 |
| Viola labradorica | Schrank | Violaceae | 8 |
| Viola lanceolata | L. | Violaceae | 8 |
| Viola missouriensis | Greene | Violaceae | 8 |
| Viola palmata | L. | Violaceae | 8 |
| Viola primulifolia | L. | Violaceae | 8 |
| Viola rafinesquei | Greene | Violaceae | 8 |
| Viola septemloba | Leconte | Violaceae | 8 |
| Viola sororia | Willd. | Violaceae | 8 |
| Viola villosa | Walter | Violaceae | 8 |
| Viola walteri | House | Violaceae | 8 |
| Vitis aestivalis | Michx. | Vitaceae | 8 |
| Vitis cinerea | (Engelm.) Millardet | Vitaceae | 8 |
| Vitis palmata | Vahl | Vitaceae | 8 |
| Vitis rotundifolia | Michx. | Vitaceae | 8 |
| Vitis shuttleworthii | House | Vitaceae | 8 |
| Vitis vulpina | L. | Vitaceae | 8 |
| Vittaria lineata | (L.) Sm. | Pteridaceae | 8 |
| Voyria parasitica | (Schltdl. & Cham.) Ruyters & Maas | Gentianaceae | 8 |
| Waltheria bahamensis | Britton | Malvaceae | 8 |
| Waltheria indica | L. | Malvaceae | 8 |
| Warea carteri | Small | Brassicaceae | 8 |
| Warea cuneifolia | (Muhl. ex Nutt.) Nutt. | Brassicaceae | 8 |
| Warea sessilifolia | Nash | Brassicaceae | 8 |
| Wisteria frutescens | (L.) Poir. | Fabaceae | 8 |
| Wolffia brasiliensis | Wedd. | Araceae | 8 |
| Wolffia columbiana | H.Karst. | Araceae | 8 |
| Wolffiella gladiata | (Hegelm.) Hegelm. | Araceae | 8 |
| Woodsia obtusa | (Sw.) Torr. | Woodsiaceae | 8 |
| Xanthium orientale | L. | Asteraceae | 8 |
| Xanthium spinosum | L. | Asteraceae | 8 |
| Xanthium strumarium | L. | Asteraceae | 8 |
| Xanthorhiza simplicissima | Marshall | Ranunculaceae | 8 |
| Ximenia americana | L. | Olacaceae | 8 |
| Xyris ambigua | Beyr. ex Kunth | Xyridaceae | 8 |
| Xyris baldwiniana | Schult. | Xyridaceae | 8 |
| Xyris brevifolia | Michx. | Xyridaceae | 8 |
| Xyris caroliniana | Walter | Xyridaceae | 8 |
| Xyris difformis | Chapm. | Xyridaceae | 8 |
| Xyris elliottii | Chapm. | Xyridaceae | 8 |
| Xyris fimbriata | Elliott | Xyridaceae | 8 |
| Xyris flabelliformis | Chapm. | Xyridaceae | 8 |
| Xyris floridana | (Kral) E.L.Bridges & Orzell | Xyridaceae | 8 |
| Xyris jupicai | Rich. | Xyridaceae | 8 |
| Xyris platylepis | Chapm. | Xyridaceae | 8 |
| Xyris smalliana | Nash | Xyridaceae | 8 |
| Xyris stenotera | (Malme) E.L.Bridges & Orzell | Xyridaceae | 8 |
| Xyris stricta | Chapm. | Xyridaceae | 8 |
| Yeatesia viridiflora | (Nees) Small | Acanthaceae | 8 |
| Yucca aloifolia | L. | Asparagaceae | 8 |
| Yucca filamentosa | L. | Asparagaceae | 8 |
| Yucca flaccida | Haw. | Asparagaceae | 8 |
| Yucca gloriosa | L. | Asparagaceae | 8 |
| Zamia integrifolia | L.f. | Zamiaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zanthoxylum americanum | Mill. | Rutaceae | 8 |
| Zanthoxylum clava-herculis | L. | Rutaceae | 8 |
| Zanthoxylum fagara | Sarg. | Rutaceae | 8 |
| Zanthoxylum flavum | Vahl | Rutaceae | 8 |
| Zephyranthes atamasco | (L.) Herb. | Amaryllidaceae | 8 |
| Zephyranthes drummondii | D.Don | Amaryllidaceae | 8 |
| Zephyranthes simpsonii | Chapm. | Amaryllidaceae | 8 |
| Zigadenus glaberrimus | Michx. | Melanthiaceae | 8 |
| Zinnia peruviana | (L.) L. | Asteraceae | 8 |
| Zizania aquatica | L. | Poaceae | 8 |
| Zizaniopsis miliacea | (Michx.) Döll & Asch. | Poaceae | 8 |
| Zizia aptera | (A.Gray) Fernald | Apiaceae | 8 |
| Zizia trifoliata | (Michx.) Fernald | Apiaceae | 8 |
| Zornia bracteata | J.F.Gmel. | Fabaceae | 8 |
| Zornia latifolia | Sm. | Fabaceae | 8 |
| Burmannia flava | Mart. | Burmanniaceae | 7 |
| Carex floridana | Schwein. | Cyperaceae | 7 |
| Carex mitchelliana | M.A.Curtis | Cyperaceae | 7 |
| Carex superata | Naczi, Reznicek & B.A.Ford | Cyperaceae | 7 |
| Centrosema sagittatum | (Humb. & Bonpl. ex Willd.) Brandegee | Fabaceae | 7 |
| Chamaecrista deeringiana | Small & Pennell | Fabaceae | 7 |
| Christella hispidula | (Decne.) Holttum | Thelypteridaceae | 7 |
| Cranichis muscosa | Sw. | Orchidaceae | 7 |
| Crossopetalum ilicifolium | (Poir.) Kuntze | Celastraceae | 7 |
| Ctenium floridanum | (Hitchc.) Hitchc. | Poaceae | 7 |
| Cyperus hortensis | (Salzm. ex Steud.) Dorr | Cyperaceae | 7 |
| Dichanthelium malacon | (Nash) LeBlond | Poaceae | 7 |
| Didiplis diandra | (Nutt. ex DC.) Alph.Wood | Lythraceae | 7 |
| Eleocharis brittonii | Svenson ex Small | Cyperaceae | 7 |
| Eleocharis nigrescens | (Nees) Kunth | Cyperaceae | 7 |
| Eleocharis vivipara | Link | Cyperaceae | 7 |
| Eriochloa acuminata | (J.Presl) Kunth | Poaceae | 7 |
| Euphorbia rosescens | E.L.Bridges & Orzell | Euphorbiaceae | 7 |
| Evolvulus convolvuloides | (Willd.) Stearn | Convolvulaceae | 7 |
| Festuca sciurea | Nutt. | Poaceae | 7 |
| Gamochaeta antillana | (Urb.) Anderb. | Asteraceae | 7 |
| Harrisia aboriginum | Small ex Britton & Rose | Cactaceae | 7 |
| Hygrophila costata | Nees | Acanthaceae | 7 |
| Isoetes hyemalis | D.F.Brunt. | Isoetaceae | 7 |
| Liatris provincialis | R.K.Godfrey | Asteraceae | 7 |
| Ophioglossum nudicaule | L.f. | Ophioglossaceae | 7 |
| Oxypolis ternata | (Nutt.) A.Heller | Apiaceae | 7 |
| Paepalanthus digynus | (Körn.) Christenh. & Byng | Eriocaulaceae | 7 |
| Paepalanthus engleri | (Ruhland) Christenh. & Byng | Eriocaulaceae | 7 |
| Paspalum eglume | Morrone & Zuloaga | Poaceae | 7 |
| Persicaria meisneriana | (Cham. & Schltdl.) M.Gómez | Polygonaceae | 7 |
| Petitia domingensis | Jacq. | Lamiaceae | 7 |
| Rhynchospora brachychaeta | C.Wright | Cyperaceae | 7 |
| Salvia chapmanii | A.Gray | Lamiaceae | 7 |
| Solidago chrysopsis | Small | Asteraceae | 7 |
| Spermolepis divaricata | (Walter) Raf. | Apiaceae | 7 |
| Utricularia floridana | Nash | Lentibulariaceae | 7 |
| Xyris calcicola | E.L.Bridges & Orzell | Xyridaceae | 7 |
| Adiantum melanoleucum | Willd. | Pteridaceae | 6 |
| Aletris bracteata | Northr. | Nartheciaceae | 6 |
| Aristida basiramea | Vasey | Poaceae | 6 |
| Asplenium heterochroum | Kunze | Aspleniaceae | 6 |
| Astragalus villosus | Michx. | Fabaceae | 6 |
| Atriplex cristata | Humb. & Bonpl. ex Willd. | Chenopodiaceae | 6 |
| Bontia daphnoides | L. | Scrophulariaceae | 6 |
| Carex alata | Torr. | Cyperaceae | 6 |
| Cuphea aspera | Chapm. | Lythraceae | 6 |
| Cyrtopodium punctatum | (L.) Lindl. | Orchidaceae | 6 |
| Dendrophylax lindenii | (Lindl.) Benth. ex Rolfe | Orchidaceae | 6 |
| Dichanthelium nudicaule | (Vasey) B.F.Hansen & Wunderlin | Poaceae | 6 |
| Eragrostis capillaris | (L.) Nees | Poaceae | 6 |
| Eragrostis frankii | Steud. | Poaceae | 6 |
| Ernodea cokeri | Britton ex Coker | Rubiaceae | 6 |
| Euphorbia deltoidea | Chapm. | Euphorbiaceae | 6 |
| Euploca fruticosa | (L.) J.I.M.Melo & Semir | Heliotropiaceae | 6 |
| Halodule wrightii | Asch. | Cymodoceaceae | 6 |
| Ilex amelanchier | M.A.Curtis ex Chapm. | Aquifoliaceae | 6 |
| Manilkara jaimiqui | Dubard | Sapotaceae | 6 |
| Passiflora pallens | Poepp. ex Mast. | Passifloraceae | 6 |
| Pectis humifusa | Sw. | Asteraceae | 6 |
| Peperomia magnoliifolia | (Jacq.) A.Dietr. | Piperaceae | 6 |
| Phalaris angusta | Nees ex Trin. | Poaceae | 6 |
| Plantago pusilla | Nutt. | Plantaginaceae | 6 |
| Polygonum careyi | Olney | Polygonaceae | 6 |
| Prescottia oligantha | (Sw.) Lindl. | Orchidaceae | 6 |
| Prosthechea pygmaea | (Hook.) W.E.Higgins | Orchidaceae | 6 |
| Pycnanthemum setosum | Nutt. | Lamiaceae | 6 |
| Rhynchospora thornei | Kral | Cyperaceae | 6 |
| Setaria macrosperma | (Scribn. & Merr.) K.Schum. | Poaceae | 6 |
| Solidago stricta | Aiton | Asteraceae | 6 |
| Stachys hyssopifolia | Michx. | Lamiaceae | 6 |
| Tridens carolinianus | (Steud.) Henrard | Poaceae | 6 |
| Varronia bullata | L. | Cordiaceae | 6 |
| Abutilon hulseanum | (Torr. & A.Gray) Torr. ex Baker f. | Malvaceae | 5 |
| Agalinis plukenetii | (Elliott) Raf. | Orobanchaceae | 5 |
| Aristida rhizomophora | Swallen | Poaceae | 5 |
| Asimina manasota | DeLaney | Annonaceae | 5 |
| Asplenium serratum | L. | Aspleniaceae | 5 |
| Bletia patula | Hook. | Orchidaceae | 5 |
| Bourreria havanensis | Miers | Ehretiaceae | 5 |
| Carex austrodeflexa | P.D.McMillan, Sorrie & van Eerden | Cyperaceae | 5 |
| Carex calcifugens | Naczi | Cyperaceae | 5 |
| Carex gholsonii | Naczi & Cochrane | Cyperaceae | 5 |
| Carex godfreyi | Naczi | Cyperaceae | 5 |
| Colubrina elliptica | (Sw.) Briz. & W.L.Stern | Rhamnaceae | 5 |
| Cyperus reflexus | Vahl | Cyperaceae | 5 |
| Dicerandra fumella | Huck | Lamiaceae | 5 |
| Didymoglossum petersii | (A.Gray) Copel. | Hymenophyllaceae | 5 |
| Dyschoriste humistrata | (Michx.) Kuntze | Acanthaceae | 5 |
| Echinochloa paludigena | Wiegand | Poaceae | 5 |
| Eleocharis flavescens | (Poir.) Urb. | Cyperaceae | 5 |
| Eleocharis microcarpa | Torr. | Cyperaceae | 5 |
| Eugenia rhombea | (O.Berg) Krug & Urb. | Myrtaceae | 5 |
| Eupatorium anomalum | Nash | Asteraceae | 5 |
| Evolvulus grisebachii | Peter | Convolvulaceae | 5 |
| Fimbristylis decipiens | Kral | Cyperaceae | 5 |
| Hymenocallis choctawensis | Traub | Amaryllidaceae | 5 |
| Hypericum nitidum | Lam. | Hypericaceae | 5 |
| Lobelia apalachicolensis | D.D.Spauld., Barger & H.E.Horne | Campanulaceae | 5 |
| Rhynchospora scirpoides | (Torr.) Griseb. | Cyperaceae | 5 |
| Rudbeckia mollis | Elliott | Asteraceae | 5 |
| Sagittaria kurziana | Glück | Alismataceae | 5 |
| Salpingostylis caelestina | (W.Bartram) Small | Iridaceae | 5 |
| Setaria chapmanii | (Vasey) Pilg. | Poaceae | 5 |
| Solanum lanceifolium | Jacq. | Solanaceae | 5 |
| Tephrosia hispidula | (Michx.) Pers. | Fabaceae | 5 |
| Thalictrum macrostylum | Small & A.Heller | Ranunculaceae | 5 |
| Tragia saxicola | Small | Euphorbiaceae | 5 |
| Verbesina heterophylla | A.Gray | Asteraceae | 5 |
| Zephyranthes treatiae | S.Watson | Amaryllidaceae | 5 |
| Aristida simpliciflora | Chapm. | Poaceae | 4 |
| Baptisia calycosa | Engelm. | Fabaceae | 4 |
| Carex seorsa | Howe | Cyperaceae | 4 |
| Chaptalia runcinata | Kunth | Asteraceae | 4 |
| Coreopsis palustris | Sorrie | Asteraceae | 4 |
| Crataegus venusta | Beadle | Rosaceae | 4 |
| Cuscuta americana | L. | Convolvulaceae | 4 |
| Dalbergia brownei | (Jacq.) Schinz | Fabaceae | 4 |
| Dichanthelium equilaterale | (Scribn.) Wipff | Poaceae | 4 |
| Dichanthelium wrightianum | (Scribn.) Freckmann | Poaceae | 4 |
| Digitaria villosa | (Walter) Pers. | Poaceae | 4 |
| Eleocharis tortilis | (Link) Schult. | Cyperaceae | 4 |
| Fuirena pumila | (Torr.) Spreng. | Cyperaceae | 4 |
| Harrisia fragrans | Small ex Britton & Rose | Cactaceae | 4 |
| Helanthium tenellum | (Mart. ex Schult.f.) Britton | Alismataceae | 4 |
| Hymenocallis tridentata | Small | Amaryllidaceae | 4 |
| Juncus gymnocarpus | Coville | Juncaceae | 4 |
| Lilium iridollae | M.G.Henry | Liliaceae | 4 |
| Ludwigia alata | Elliott | Onagraceae | 4 |
| Malvastrum corchorifolium | (Desr.) Britton ex Small | Malvaceae | 4 |
| Mammea americana | L. | Calophyllaceae | 4 |
| Nemastylis floridana | Small | Iridaceae | 4 |
| Orbexilum virgatum | (Nutt.) Rydb. | Fabaceae | 4 |
| Pecluma struthionis | (L.) Boudrie, Cremers & Viane | Polypodiaceae | 4 |
| Pinckneya pubens | Michx. | Rubiaceae | 4 |
| Rottboellia tuberculosa | (Nash) Hitchc. | Poaceae | 4 |
| Rudbeckia mohrii | A.Gray | Asteraceae | 4 |
| Sabatia dodecandra | (L.) Britton, Sterns & Poggenb. | Gentianaceae | 4 |
| Sagittaria subulata | (L.) Buchenau | Alismataceae | 4 |
| Sapindus marginatus | Willd. | Sapindaceae | 4 |
| Scutellaria havanensis | Jacq. | Lamiaceae | 4 |
| Stelis gelida | (Lindl.) Pridgeon & M.W.Chase | Orchidaceae | 4 |
| Triphora craigheadii | Luer | Orchidaceae | 4 |
| Vanilla barbellata | Rchb.f. | Orchidaceae | 4 |
| Xyris laxifolia | Mart. | Xyridaceae | 4 |
| Amaranthus crassipes | Schltdl. | Amaranthaceae | 3 |
| Amyris balsamifera | L. | Rutaceae | 3 |
| Andropogon tener | (Nees) Kunth | Poaceae | 3 |
| Aristida mohrii | Nash | Poaceae | 3 |
| Asplenium verecundum | Chapm. | Aspleniaceae | 3 |
| Campylocentrum pachyrrhizum | (Rchb.f.) Rolfe | Orchidaceae | 3 |
| Campyloneurum brevifolium | (Lodd. ex Link) Link | Polypodiaceae | 3 |
| Campyloneurum costatum | C.Presl | Polypodiaceae | 3 |
| Cantinoa americana | (Aubl.) Harley & J.F.B.Pastore | Lamiaceae | 3 |
| Carex lupuliformis | Sartwell ex Dewey | Cyperaceae | 3 |
| Carex paeninsulae | Naczi, E.L.Bridges & Orzell | Cyperaceae | 3 |
| Ceratopteris pteridoides | (Hook.) Hieron. | Pteridaceae | 3 |
| Ceratopteris thalictroides | (L.) Brongn. | Pteridaceae | 3 |
| Cienfuegosia yucatanensis | Millsp. | Malvaceae | 3 |
| Crataegus alabamensis | Beadle | Rosaceae | 3 |
| Cyperus neotropicalis | Alain | Cyperaceae | 3 |
| Dicerandra frutescens | Shinners | Lamiaceae | 3 |
| Echinochloa polystachya | (Kunth) Hitchc. | Poaceae | 3 |
| Euphorbia ogdenii | K.Bradley & Sadle | Euphorbiaceae | 3 |
| Gouania polygama | (Jacq.) Urb. | Rhamnaceae | 3 |
| Gyminda latifolia | (Sw.) Urb. | Celastraceae | 3 |
| Hypoxis sessilis | L. | Hypoxidaceae | 3 |
| Iris hexagona | Walter | Iridaceae | 3 |
| Lupinus aridorum | McFarlin ex Beckner | Fabaceae | 3 |
| Nymphaea jamesoniana | Planch. | Nymphaeaceae | 3 |
| Oenothera nutans | G.F.Atk. & Bartlett | Onagraceae | 3 |
| Pelexia adnata | (Sw.) Poit. ex Rich. | Orchidaceae | 3 |
| Phlox floridana | Benth. | Polemoniaceae | 3 |
| Phyllanthus liebmannianus | Müll.Arg. | Phyllanthaceae | 3 |
| Potamogeton pulcher | Tuck. | Potamogetonaceae | 3 |
| Pteridium latiusculum | Hieron. | Dennstaedtiaceae | 3 |
| Rhynchospora stenophylla | Chapm. | Cyperaceae | 3 |
| Rubus probabilis | L.H.Bailey | Rosaceae | 3 |
| Sagittaria filiformis | J.G.Sm. | Alismataceae | 3 |
| Sagittaria isoetiformis | J.G.Sm. | Alismataceae | 3 |
| Scleria bellii | LeBlond | Cyperaceae | 3 |
| Scleria lithosperma | (L.) Sw. | Cyperaceae | 3 |
| Spiranthes eatonii | Ames ex P.M.Br. | Orchidaceae | 3 |
| Terminalia molinetii | M.Gómez | Combretaceae | 3 |
| Tetramicra canaliculata | (Aubl.) Urb. | Orchidaceae | 3 |
| Triphora yucatanensis | Ames | Orchidaceae | 3 |
| Xyris scabrifolia | R.M.Harper | Xyridaceae | 3 |
| Xyris serotina | Chapm. | Xyridaceae | 3 |