| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BOST3 | Boehmeria stipularis Weddell | Boehmeria grandis | Urticaceae
|
| BOEHM | Boehmeria Jacq. | false nettle | Urticaceae
|
| BOAN | Boerhavia anisophylla Torr. | wineflower | Nyctaginaceae
|
| BOAN4 | Boerhavia annulata Coville | Anulocaulis annulatus | Nyctaginaceae
|
| BOCO | Boerhavia coccinea P. Mill. | scarlet spiderling | Nyctaginaceae
|
| BOCO2 | Boerhavia coulteri (Hook. f.) S. Wats. | Coulter's spiderling | Nyctaginaceae
|
| BODIG | Boerhavia diffusa L. var. gymnocarpa Heimerl | Boerhavia repens | Nyctaginaceae
|
| BODIP | Boerhavia diffusa L. var. pseudotetrandra Heimerl | Boerhavia repens | Nyctaginaceae
|
| BODIS | Boerhavia diffusa L. var. sandwicensis Heimerl | Boerhavia repens | Nyctaginaceae
|
| BODIT | Boerhavia diffusa L. var. tetrandra (G. Forst.) Heimerl | Boerhavia repens | Nyctaginaceae
|
| BODI3 | Boerhavia diffusa L. | red spiderling | Nyctaginaceae
|
| BOERI | Boerhavia erecta L. var. intermedia (M.E. Jones) Kearney & Peebles | Boerhavia intermedia | Nyctaginaceae
|
| BOER | Boerhavia erecta L. | erect spiderling | Nyctaginaceae
|
| BOER5 | Boerhavia eriosolena Gray | Anulocaulis eriosolenus | Nyctaginaceae
|
| BOGL6 | Boerhavia glabrata Blume | Boerhavia diffusa | Nyctaginaceae
|
| BOGR | Boerhavia gracillima Heimerl | slimstalk spiderling | Nyctaginaceae
|
| BOGY | Boerhavia gypsophiloides (Mart. & Gal.) Coult. | Cyphomeris gypsophiloides | Nyctaginaceae
|
| BOHE2 | Boerhavia herbstii Fosberg | alena | Nyctaginaceae
|
| BOIN | Boerhavia intermedia M.E. Jones | fivewing spiderling | Nyctaginaceae
|
| BOLE3 | Boerhavia leiosolena Torr. | Anulocaulis leiosolenus var. leiosolenus | Nyctaginaceae
|
| BOLI4 | Boerhavia lindheimeri Standl. | Boerhavia linearifolia | Nyctaginaceae
|
| BOLI2 | Boerhavia linearifolia Gray | narrowleaf spiderling | Nyctaginaceae
|
| BOMA5 | Boerhavia mathisiana F.B. Jones | Mathis' spiderling | Nyctaginaceae
|
| BOME | Boerhavia megaptera Standl. | Tucson Mountain spiderling | Nyctaginaceae
|
| BOPT | Boerhavia pterocarpa S. Wats. | Apache Pass spiderling | Nyctaginaceae
|
| BOPU | Boerhavia purpurascens Gray | purple spiderling | Nyctaginaceae
|
| BORE4 | Boerhavia repens L. | anena | Nyctaginaceae
|
| BOSC | Boerhavia scandens L. | climbing wartclub | Nyctaginaceae
|
| BOSP | Boerhavia spicata Choisy | creeping spiderling | Nyctaginaceae
|
| BOTE9 | Boerhavia tenuifolia Gray | Boerhavia linearifolia | Nyctaginaceae
|
| BOTO2 | Boerhavia torreyana (S. Wats.) Standl. | Boerhavia spicata | Nyctaginaceae
|
| BOTR | Boerhavia triquetra S. Wats. | slender spiderling | Nyctaginaceae
|
| BOWR | Boerhavia wrightii Gray | largebract spiderling | Nyctaginaceae
|
| BOERH2 | Boerhavia L. | spiderling | Nyctaginaceae
|
| BORO4 | Boesenbergia rotunda (L.) Mansf. | rotund boesenbergia | Zingiberaceae
|
| BOESE | Boesenbergia Kuntze | boesenbergia | Zingiberaceae
|
| BOCR2 | Bogenhardia crispa (L.) Kearney | Herissantia crispa | Malvaceae
|
| BOCL | Boisduvalia cleistogama Curran | Epilobium cleistogamum | Onagraceae
|
| BODEP | Boisduvalia densiflora (Lindl.) S. Wats. var. pallescens Suksdorf | Epilobium densiflorum | Onagraceae
|
| BODES | Boisduvalia densiflora (Lindl.) S. Wats. var. salicina (Nutt. ex Torr. & Gray) Munz | Epilobium densiflorum | Onagraceae
|
| BODE | Boisduvalia densiflora (Lindl.) S. Wats. | Epilobium densiflorum | Onagraceae
|
| BOGLC | Boisduvalia glabella (Nutt.) Walp. var. campestris (Jepson) Jepson | Epilobium pygmaeum | Onagraceae
|
| BOGL | Boisduvalia glabella (Nutt.) Walp. | Epilobium pygmaeum | Onagraceae
|
| BOMA | Boisduvalia macrantha Heller | Epilobium pallidum | Onagraceae
|
| BOPA3 | Boisduvalia pallida Eastw. | Epilobium pallidum | Onagraceae
|
| BOPY | Boisduvalia pygmaea (Speg.) Munz | Epilobium pygmaeum | Onagraceae
|
| BOSA4 | Boisduvalia salicina (Nutt. ex Torr. & Gray) Rydb. | Epilobium densiflorum | Onagraceae
|
| BOST | Boisduvalia stricta (Gray) Greene | Epilobium torreyi | Onagraceae
|
| BOCA | Bolandra californica Gray | Sierra false coolwort | Saxifragaceae
|
| BOORI | Bolandra oregana S. Wats. var. imnahaensis M.E. Peck | Bolandra oregana | Saxifragaceae
|
| BOOR | Bolandra oregana S. Wats. | northern false coolwort | Saxifragaceae
|
| BOLAN | Bolandra Gray | false coolwort | Saxifragaceae
|
| BOAL2 | Bolbitis aliena (Sw.) Alston | diamond creepingfern | Dryopteridaceae
|
| BOCL2 | Bolbitis cladorrhizans (Spreng.) Ching | Bolbitis portoricensis | Dryopteridaceae
|
| BONI | Bolbitis nicotianifolia (Sw.) Alston | thinleaf creepingfern | Dryopteridaceae
|
| BOPE | Bolbitis pergamentacea (Maxon) Ching | woodland creepingfern | Dryopteridaceae
|
| BOPO | Bolbitis portoricensis (Spreng.) Hennipman | Puerto Rico creepingfern | Dryopteridaceae
|
| BOLBI | Bolbitis Schott | creepingfern | Dryopteridaceae
|
| BOPA5 | Bolbophyllaria pachyrrachis (A. Rich.) Reichenb. f. | Bulbophyllum pachyrrachis | Orchidaceae
|
| BOFL3 | Bolboschoenus fluviatilis (Torr.) Soj�k | Schoenoplectus fluviatilis | Cyperaceae
|
| BOGL9 | Bolboschoenus glaucus (Lam.) S.G. Sm. | Schoenoplectus glaucus | Cyperaceae
|
| BOMAF | Bolboschoenus maritimus (L.) Palla ssp. fluviatilis (Torr.) A.& D. L�ve | Schoenoplectus fluviatilis | Cyperaceae
|
| BOMAP | Bolboschoenus maritimus (L.) Palla ssp. paludosus (A. Nels.) A.& D. L�ve | Schoenoplectus maritimus | Cyperaceae
|
| BOMA7 | Bolboschoenus maritimus (L.) Palla | Schoenoplectus maritimus | Cyperaceae
|
| BONO | Bolboschoenus novae-angliae (Britt.) S.G. Sm. | Schoenoplectus novae-angliae | Cyperaceae
|
| BOPA7 | Bolboschoenus paludosus (A. Nels.) So� | Schoenoplectus maritimus | Cyperaceae
|
| BORO5 | Bolboschoenus robustus (Pursh) Soj�k | Schoenoplectus robustus | Cyperaceae
|
| BOCE | Bolboxalis cernua (Thunb.) Small | Oxalis pes-caprae | Oxalidaceae
|
| BOAL5 | Bolophyta alpina Nutt. | Parthenium alpinum | Asteraceae
|
| BOLI5 | Bolophyta ligulata (M.E. Jones) W.A. Weber | Parthenium ligulatum | Asteraceae
|
| BOTE7 | Bolophyta tetraneuris (Barneby) W.A. Weber | Parthenium tetraneuris | Asteraceae
|
| BOAP | Boltonia apalachicolensis L.C. Anders. | Apalachicola doll's daisy | Asteraceae
|
| BOASA | Boltonia asteroides (L.) L'H�r. var. asteroides | white doll's daisy | Asteraceae
|
| BOASD | Boltonia asteroides (L.) L'H�r. var. decurrens (Torr. & Gray) Fern. | Boltonia decurrens | Asteraceae
|
| BOASG | Boltonia asteroides (L.) L'H�r. var. glastifolia (Hill) Fern. | Boltonia asteroides var. asteroides | Asteraceae
|
| BOASL | Boltonia asteroides (L.) L'H�r. var. latisquama (Gray) Cronq. | white doll's daisy | Asteraceae
|
| BOASR | Boltonia asteroides (L.) L'H�r. var. recognita (Fern. & Grisc.) Cronq. | white doll's daisy | Asteraceae
|
| BOAS | Boltonia asteroides (L.) L'H�r. | white doll's daisy | Asteraceae
|
| BOCA2 | Boltonia caroliniana (Walt.) Fern. | Carolina doll's daisy | Asteraceae
|
| BODE2 | Boltonia decurrens (Torr. & Gray) Wood | claspingleaf doll's daisy | Asteraceae
|
| BODID | Boltonia diffusa Ell. var. diffusa | smallhead doll's daisy | Asteraceae
|
| BODII | Boltonia diffusa Ell. var. interior Fern. & Grisc. | smallhead doll's daisy | Asteraceae
|
| BODI | Boltonia diffusa Ell. | smallhead doll's daisy | Asteraceae
|
| BOIN5 | Boltonia interior (Fern. & Grisc.) G.N. Jones | Boltonia diffusa var. interior | Asteraceae
|
| BOLAD | Boltonia latisquama Gray var. decurrens (Torr. & Gray) Fern. & Grisc. | Boltonia decurrens | Asteraceae
|
| BOLAM | Boltonia latisquama Gray var. microcephala Fern. & Grisc. | Boltonia asteroides var. recognita | Asteraceae
|
| BOLAO | Boltonia latisquama Gray var. occidentalis Gray | Boltonia asteroides var. recognita | Asteraceae
|
| BOLAR | Boltonia latisquama Gray var. recognita Fern. & Grisc. | Boltonia asteroides var. recognita | Asteraceae
|
| BOLA3 | Boltonia latisquama Gray | Boltonia asteroides var. latisquama | Asteraceae
|
| BORA3 | Boltonia ravenelii Fern. & Grisc. | Boltonia caroliniana | Asteraceae
|
| BORE8 | Boltonia recognita (Fern. & Grisc.) G.N. Jones | Boltonia asteroides var. recognita | Asteraceae
|
| BOLTO | Boltonia L'H�r. | doll's daisy | Asteraceae
|
| BOKA2 | Bomarea kalbreyeri Baker | | Liliaceae
|
| BOMAR | Bomarea Mirb. | bomarea | Liliaceae
|
| BOCE2 | Bombax ceiba L. | red silk cottontree | Bombacaceae
|
| BOMA8 | Bombax malabaricum DC. | Bombax ceiba | Bombacaceae
|
| BOPE7 | Bombax pentandrum L. | Ceiba pentandra | Bombacaceae
|
| BOVI3 | Bombax vitifolium Willd. | Cochlospermum vitifolium | Bixaceae
|
| BOMBA | Bombax L. | cottontree | Bombacaceae
|
| BODO2 | Bombyliospora domingensis (Pers.) Zahlbr. | Letrouitia domingensis | Letrouitiaceae
|
| BOPA10 | Bombyliospora pachycheila (Tuck.) Zahlbr. | Megalospora pachycheila | Megalosporaceae
|