| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BIFOR | Bifora Hoffmann | bishop | Apiaceae
|
| BIBR | Bigelovia brachylepis Gray | Ericameria brachylepis | Asteraceae
|
| BIIN3 | Bigelovia intricata Gray | Machaeranthera carnosa var. intricata | Asteraceae
|
| BIVA2 | Bigelovia vaseyi Gray | Chrysothamnus vaseyi | Asteraceae
|
| BINUA | Bigelowia nudata (Michx.) DC. ssp. australis L.C. Anders. | pineland rayless goldenrod | Asteraceae
|
| BINUN | Bigelowia nudata (Michx.) DC. ssp. nudata | pineland rayless goldenrod | Asteraceae
|
| BINUA2 | Bigelowia nudata (Michx.) DC. var. australis (L.C. Anders.) Shinners | Bigelowia nudata ssp. australis | Asteraceae
|
| BINU | Bigelowia nudata (Michx.) DC. | pineland rayless goldenrod | Asteraceae
|
| BINU2 | Bigelowia nuttallii L.C. Anders. | Nuttall's rayless goldenrod | Asteraceae
|
| BIVI3 | Bigelowia virgata (Nutt.) DC. | Bigelowia nudata ssp. nudata | Asteraceae
|
| BIGEL | Bigelowia DC. | rayless goldenrod | Asteraceae
|
| BICA5 | Bignonia capensis Thunb. | Tecoma capensis | Bignoniaceae
|
| BICA | Bignonia capreolata L. | crossvine | Bignoniaceae
|
| BICA6 | Bignonia caryophyllea Bello | Tynanthus polyanthus | Bignoniaceae
|
| BILI | Bignonia linearis Cav. | Chilopsis linearis ssp. linearis | Bignoniaceae
|
| BIRA2 | Bignonia radicans L. | Campsis radicans | Bignoniaceae
|
| BIST2 | Bignonia stans L. | Tecoma stans | Bignoniaceae
|
| BIUN | Bignonia unguis-cati L. | Macfadyena unguis-cati | Bignoniaceae
|
| BIVE | Bignonia venusta Ker-Gawl. | Pyrostegia venusta | Bignoniaceae
|
| BIGNO | Bignonia L. | bignonia | Bignoniaceae
|
| BISE | Bigonia sempervirens L. | Gelsemium sempervirens | Loganiaceae
|
| BIBI6 | Bihai bihai (L.) Griggs | Heliconia bihai | Heliconiaceae
|
| BIAU2 | Bilderdykia aubertii (Henry) Moldenke | Polygonum aubertii | Polygonaceae
|
| BIBA | Bilderdykia baldschuanica (Regel) D.A. Webber | Polygonum baldschuanicum | Polygonaceae
|
| BICIL | Bilderdykia cilinodis (Michx.) Greene var. laevigata (Fern.) C.F. Reed | Polygonum cilinode | Polygonaceae
|
| BICI | Bilderdykia cilinodis (Michx.) Greene | Polygonum cilinode | Polygonaceae
|
| BICO7 | Bilderdykia convolvulus (L.) Dumort. | Polygonum convolvulus var. convolvulus | Polygonaceae
|
| BICR | Bilderdykia cristata (Engelm. & Gray) Greene | Polygonum scandens var. cristatum | Polygonaceae
|
| BIDU | Bilderdykia dumetorum (L.) Dumort. | Polygonum scandens var. dumetorum | Polygonaceae
|
| BISCC | Bilderdykia scandens (L.) Greene var. cristata (Engelm. & Gray) C.F. Reed | Polygonum scandens var. cristatum | Polygonaceae
|
| BISC | Bilderdykia scandens (L.) Greene | Polygonum scandens var. scandens | Polygonaceae
|
| BICA8 | Bilimbia caudata (Nyl.) Fink | Ropalospora lugubris | Fuscideaceae
|
| BIPA | Bilimbia pammellii Fink | Bacidia granosa | Bacidiaceae
|
| BITR3 | Bilimbia tricholoma (Mont.) Fink | Byssoloma tricholomum | Pilocarpaceae
|
| BIPY | Billbergia pyramidalis (Sims) Lindl. | foolproofplant | Bromeliaceae
|
| BILLB | Billbergia Thunb. | billbergia | Bromeliaceae
|
| BIHE4 | Billieturnera helleri (Rose ex Heller) Fryxell | coppery false fanpetals | Malvaceae
|
| BILLI | Billieturnera Fryxell | false fanpetals | Malvaceae
|
| BIVA3 | Biltia vaseyi (Gray) Small | Rhododendron vaseyi | Ericaceae
|
| BIOR80 | Biota orientalis (L.) Endl. | Platycladus orientalis | Cupressaceae
|
| BIOL | Biovularia olivacea (C. Wright ex Griseb.) Kam. | Utricularia olivacea | Lentibulariaceae
|
| BIJA | Bischofia javanica Blume | Javanese bishopwood | Euphorbiaceae
|
| BISCH | Bischofia Blume | bishopwood | Euphorbiaceae
|
| BIBI5 | Bistorta bistortoides (Pursh) Small | Polygonum bistortoides | Polygonaceae
|
| BIVI2 | Bistorta vivipara (L.) S.F. Gray | Polygonum viviparum | Polygonaceae
|
| BIBI4 | Bituminaria bituminosa (L.) Stirton | Arabian pea | Fabaceae
|
| BITUM | Bituminaria Heister ex Fabr. | bituminaria | Fabaceae
|
| BIVA4 | Biventraria variegata (L.) Small | Asclepias variegata | Asclepiadaceae
|
| BIST3 | Bivonea stimulosa (Michx.) Raf. | Cnidoscolus stimulosus | Euphorbiaceae
|
| BIOR | Bixa orellana L. | lipsticktree | Bixaceae
|
| BIXA | Bixa L. | bixa | Bixaceae
|
| BLPU2 | Blasia pusilla L. | | Blasiaceae
|
| BLASI | Blasia L. | | Blasiaceae
|
| BLFI | Blastania fimbristipula Kotschy & Peyr. | Ctenolepis cerasiformis | Cucurbitaceae
|
| BLDI2 | Blastenia diphasia (Tuck.) Zahlbr. | Caloplaca diphasia | Teloschistaceae
|
| BLNO | Blastenia novomexicana Fink | Caloplaca novomexicana | Teloschistaceae
|
| BLRU2 | Blastenia rubrofusca de Lesd. | Caloplaca rubrofusca | Teloschistaceae
|
| BLCH3 | Blechnum chordatum (Desv.) Hieron. | Chilean hard fern | Blechnaceae
|
| BLDI | Blechnum divergens (Kunze) Mett. | ravine midsorus fern | Blechnaceae
|
| BLFR | Blechnum fragile (Liebm.) Morton & Lellinger | fragile midsorus fern | Blechnaceae
|
| BLIN2 | Blechnum indicum auct. non Burm. | Blechnum serrulatum | Blechnaceae
|
| BLIN | Blechnum insularum Morton & Lellinger | graceful midsorus fern | Blechnaceae
|
| BLLI | Blechnum lineatum (Sw.) C. Christens. | rockbank midsorus fern | Blechnaceae
|
| BLOCM | Blechnum occidentale L. var. minor Hook. | Blechnum occidentale | Blechnaceae
|
| BLOC | Blechnum occidentale L. | hammock fern | Blechnaceae
|
| BLPO2 | Blechnum polypodioides (Sw.) Kuhn | Blechnum fragile | Blechnaceae
|
| BLPO | Blechnum polypodioides Raddi | narrowleaf midsorus fern | Blechnaceae
|
| BLSE | Blechnum serrulatum L.C. Rich. | toothed midsorus fern | Blechnaceae
|
| BLSPN | Blechnum spicant (L.) Sm. ssp. nipponicum auct. non (Kunze) A.& D. L�ve | Blechnum spicant | Blechnaceae
|
| BLSPE | Blechnum spicant (L.) Sm. var. elongatum (Hook.) Boivin | Blechnum spicant | Blechnaceae
|
| BLSP | Blechnum spicant (L.) Sm. | deer fern | Blechnaceae
|
| BLUN | Blechnum unilaterale Sw. | Blechnum polypodioides | Blechnaceae
|
| BLECH | Blechnum L. | midsorus fern | Blechnaceae
|
| BLBL | Blechum blechum (L.) Millsp. | Blechum pyramidatum | Acanthaceae
|
| BLBR | Blechum brownei Juss. | Blechum pyramidatum | Acanthaceae
|
| BLPY | Blechum pyramidatum (Lam.) Urban | Browne's blechum | Acanthaceae
|
| BLECH2 | Blechum P. Br. | blechum | Acanthaceae
|
| BLBA | Blennosperma bakeri Heiser | Baker's stickyseed | Asteraceae
|
| BLNAN | Blennosperma nanum (Hook.) Blake var. nanum | common stickyseed | Asteraceae
|
| BLNAR | Blennosperma nanum (Hook.) Blake var. robustum J.T. Howell | common stickyseed | Asteraceae
|
| BLNA | Blennosperma nanum (Hook.) Blake | common stickyseed | Asteraceae
|
| BLENN | Blennosperma Less. | stickyseed | Asteraceae
|
| BLBI | Blepharidachne bigelovii (S. Wats.) Hack. | Bigelow's desertgrass | Poaceae
|
| BLKI | Blepharidachne kingii (S. Wats.) Hack. | King's eyelashgrass | Poaceae
|
| BLEPH | Blepharidachne Hack. | desertgrass | Poaceae
|
| BLBL2 | Blephariglotis blephariglottis (Willd.) Rydb. | Platanthera blephariglottis var. blephariglottis | Orchidaceae
|
| BLCH2 | Blephariglotis chapmanii Small | Platanthera chapmanii | Orchidaceae
|
| BLCI2 | Blephariglotis ciliaris (L.) Rydb. | Platanthera ciliaris | Orchidaceae
|
| BLCO | Blephariglotis conspicua (Nash) Small | Platanthera blephariglottis var. conspicua | Orchidaceae
|
| BLCR2 | Blephariglotis cristata (Michx.) Raf. | Platanthera cristata | Orchidaceae
|
| BLGR | Blephariglotis grandiflora (Bigelow) Rydb. | Platanthera grandiflora | Orchidaceae
|
| BLLA2 | Blephariglotis lacera (Michx.) Farw. | Platanthera lacera | Orchidaceae
|
| BLLE | Blephariglotis leucophaea (Nutt.) Farw. | Platanthera leucophaea | Orchidaceae
|
| BLPE | Blephariglotis peramoena (Gray) Rydb. | Platanthera peramoena | Orchidaceae
|
| BLPS | Blephariglotis psycodes (L.) Rydb. | Platanthera psycodes | Orchidaceae
|
| BLSCL | Blepharipappus scaber Hook. ssp. laevis (Gray) Keck | rough eyelashweed | Asteraceae
|
| BLSCS | Blepharipappus scaber Hook. ssp. scaber | rough eyelashweed | Asteraceae
|
| BLSC | Blepharipappus scaber Hook. | rough eyelashweed | Asteraceae
|
| BLEPH2 | Blepharipappus Hook. | blepharipappus | Asteraceae
|
| BLPLP | Blepharizonia plumosa (Kellogg) Greene ssp. plumosa | big tarweed | Asteraceae
|
| BLPLV | Blepharizonia plumosa (Kellogg) Greene ssp. viscida Keck | big tarweed | Asteraceae
|