| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| BERGE2 | Bergenia Moench | elephant-ear | Saxifragaceae
|
| BEEM | Bergerocactus emoryi (Engelm.) Engelm. | golden snakecactus | Cactaceae
|
| BERGE | Bergerocactus Britt. & Rose | snakecactus | Cactaceae
|
| BEEM2 | Bergerocereus emoryi (Engelm.) Britt. & Rose | Bergerocactus emoryi | Cactaceae
|
| BETE | Bergia texana (Hook.) Seub. ex Walp. | Texas bergia | Elatinaceae
|
| BERGI | Bergia L. | bergia | Elatinaceae
|
| BEHE | Berkheya heterophylla O. Hoffmann | prickly gousblom | Asteraceae
|
| BERKH | Berkheya Ehrh. | berkheya | Asteraceae
|
| BEBE | Berlandiera �betonicifolia (Hook.) Small (pro sp.) | | Asteraceae
|
| BEDE3 | Berlandiera dealbata (Torr. & Gray) Small | Berlandiera pumila | Asteraceae
|
| BEHU | Berlandiera �humilis Small (pro sp.) | | Asteraceae
|
| BELYM | Berlandiera lyrata Benth. var. macrophylla Gray | Berlandiera lyrata | Asteraceae
|
| BELY | Berlandiera lyrata Benth. | lyreleaf greeneyes | Asteraceae
|
| BEPU2 | Berlandiera pumila (Michx.) Nutt. | soft greeneyes | Asteraceae
|
| BESU | Berlandiera subacaulis (Nutt.) Nutt. | Florida greeneyes | Asteraceae
|
| BETEB | Berlandiera texana DC. var. betonicifolia (Hook.) Torr. & Gray | Berlandiera betonicifolia | Asteraceae
|
| BETE2 | Berlandiera texana DC. | Texas greeneyes | Asteraceae
|
| BETOD | Berlandiera tomentosa (Pursh) Nutt. var. dealbata Torr. & Gray | Berlandiera pumila | Asteraceae
|
| BETO | Berlandiera tomentosa (Pursh) Nutt. | Berlandiera pumila | Asteraceae
|
| BERLA | Berlandiera DC. | greeneyes | Asteraceae
|
| BEDI2 | Bernardia dichotoma (Willd.) Muell.-Arg. | Caribbean myrtlecroton | Euphorbiaceae
|
| BEIN | Bernardia incana Morton | hoary myrtlecroton | Euphorbiaceae
|
| BEMY | Bernardia myricifolia (Scheele) S. Wats. | mouse's eye | Euphorbiaceae
|
| BEOB | Bernardia obovata I.M. Johnston | desert myrtlecroton | Euphorbiaceae
|
| BERNA | Bernardia P. Mill. | myrtlecroton | Euphorbiaceae
|
| BEIN2 | Berteroa incana (L.) DC. | hoary false madwort | Brassicaceae
|
| BEMU | Berteroa mutabilis (Vent.) DC. | roadside false madwort | Brassicaceae
|
| BERTE | Berteroa DC. | false madwort | Brassicaceae
|
| BESE2 | Berthelotia sericea (Nutt.) Rydb. | Pluchea sericea | Asteraceae
|
| BEEX2 | Bertholletia excelsa Humb. & Bonpl. | brazilnut | Lecythidaceae
|
| BERTH | Bertholletia Humb. & Bonpl. | bertholletia | Lecythidaceae
|
| BEERI2 | Berula erecta (Huds.) Coville var. incisa (Torr.) Cronq. | Berula erecta | Apiaceae
|
| BEER | Berula erecta (Huds.) Coville | cutleaf waterparsnip | Apiaceae
|
| BEIN3 | Berula incisa (Torr.) G.N. Jones | Berula erecta | Apiaceae
|
| BEPU6 | Berula pusilla Fern. | Berula erecta | Apiaceae
|
| BERUL | Berula Bess. ex W.D.J. Koch | waterparsnip | Apiaceae
|
| BEAL | Besseya alpina (Gray) Rydb. | alpine besseya | Scrophulariaceae
|
| BEAR | Besseya arizonica Pennell | Arizona coraldrops | Scrophulariaceae
|
| BEBU | Besseya bullii (Eat.) Rydb. | Bull's coraldrops | Scrophulariaceae
|
| BECI2 | Besseya cinerea (Raf.) Pennell | Besseya wyomingensis | Scrophulariaceae
|
| BEOB2 | Besseya oblongifolia Pennell | eggleaf coraldrops | Scrophulariaceae
|
| BEPL | Besseya plantaginea (James) Rydb. | White River coraldrops | Scrophulariaceae
|
| BERI | Besseya ritteriana (Eastw.) Rydb. | Ritter's coraldrops | Scrophulariaceae
|
| BERU | Besseya rubra (Dougl. ex Hook.) Rydb. | red besseya | Scrophulariaceae
|
| BEWY | Besseya wyomingensis (A. Nels.) Rydb. | Wyoming besseya | Scrophulariaceae
|
| BESSE | Besseya Rydb. | kittentail | Scrophulariaceae
|
| BEBRH | Bestia breweriana (Lesq.) Grout var. howei (Kindb.) Grout | Isothecium cristatum | Brachytheciaceae
|
| BEBRL | Bestia breweriana (Lesq.) Grout var. lutescens (Lesq. & James) Grout | Isothecium cristatum | Brachytheciaceae
|
| BEBR | Bestia breweriana (Lesq.) Grout | Isothecium cristatum | Brachytheciaceae
|
| BECR2 | Bestia cristata (Hampe) L. Koch | Isothecium cristatum | Brachytheciaceae
|
| BEHO2 | Bestia holzingeri (Ren. & Card.) Broth. | Porotrichum vancouveriense | Thamnobryaceae
|
| BELO2 | Bestia longipes (Sull. & Lesq.) Broth. | bestia moss | Brachytheciaceae
|
| BEOC3 | Bestia occidentalis (Sull. & Lesq.) Grout | Porotrichum vancouveriense | Thamnobryaceae
|
| BEVA | Bestia vancouveriensis (Kindb. in Mac.) Wijk & Marg. | Porotrichum vancouveriense | Thamnobryaceae
|
| BESTI | Bestia Broth. | bestia moss | Brachytheciaceae
|
| BEAD | Beta adanensis A. Pamukc. ex Aellen | beet | Chenopodiaceae
|
| BEAT | Beta atriplicifolia Rouy | beet | Chenopodiaceae
|
| BECI4 | Beta cicla (L.) L. | Beta vulgaris ssp. cicla | Chenopodiaceae
|
| BECO6 | Beta corolliflora Zossimovic | Beta trigyna | Chenopodiaceae
|
| BELO | Beta lomatogona Fischer & C. Meyer | beet | Chenopodiaceae
|
| BEMA4 | Beta macrocarpa Guss. | Beta vulgaris ssp. macrocarpa | Chenopodiaceae
|
| BEMA3 | Beta maritima L. | Beta vulgaris | Chenopodiaceae
|
| BENA2 | Beta nana Boiss. & Heldr. | beet | Chenopodiaceae
|
| BEPA2 | Beta patellaris Moq. | beet | Chenopodiaceae
|
| BEPA3 | Beta patula Aiton | beet | Chenopodiaceae
|
| BEPR | Beta procumbens L. | cultivated beet | Chenopodiaceae
|
| BETR4 | Beta trigyna Waldst. & Kit. | beet | Chenopodiaceae
|
| BETR3 | Beta trojana A. Pamukc. ex Aellen | trojan beet | Chenopodiaceae
|
| BEVUC | Beta vulgaris L. ssp. cicla (L.) Koch | chard | Chenopodiaceae
|
| BEVUM2 | Beta vulgaris L. ssp. macrocarpa (Guss.) Thell. | beet | Chenopodiaceae
|
| BEVUM | Beta vulgaris L. ssp. maritima (L.) Arcang. | Beta vulgaris | Chenopodiaceae
|
| BEVUC2 | Beta vulgaris L. var. cicla L. | Beta vulgaris ssp. cicla | Chenopodiaceae
|
| BEVU2 | Beta vulgaris L. | common beet | Chenopodiaceae
|
| BETA | Beta L. | beet | Chenopodiaceae
|
| BEGR | Betonica grandiflora Willd. | Stachys grandiflora | Lamiaceae
|
| BEOF | Betonica officinalis L. | Stachys officinalis | Lamiaceae
|
| BEAL5 | Betula alaskana Sarg. | Betula neoalaskana | Betulaceae
|
| BEALC | Betula alba L. var. commutata Regel | Betula papyrifera var. commutata | Betulaceae
|
| BEALC2 | Betula alba L. var. cordifolia (Regel) Regel | Betula papyrifera var. cordifolia | Betulaceae
|
| BEAL3 | Betula alba L. | Betula pubescens | Betulaceae
|
| BEALA | Betula alleghaniensis Britt. var. alleghaniensis | yellow birch | Betulaceae
|
| BEALF | Betula alleghaniensis Britt. var. fallax (Fassett) Brayshaw | Betula alleghaniensis var. alleghaniensis | Betulaceae
|
| BEALM | Betula alleghaniensis Britt. var. macrolepis (Fern.) Brayshaw | yellow birch | Betulaceae
|
| BEAL2 | Betula alleghaniensis Britt. | yellow birch | Betulaceae
|
| BEAN | Betula andrewsii A. Nels. | Betula utahensis | Betulaceae
|
| BEAR2 | Betula �arbuscula Dugle | Betula eastwoodiae | Betulaceae
|
| BEBE3 | Betula beeniana A. Nels. | Betula occidentalis | Betulaceae
|
| BEBO | Betula borealis Spach | northern birch | Betulaceae
|
| BECAC | Betula �caerulea Blanch. (pro sp.) var. caerulea | blue birch | Betulaceae
|
| BECAG | Betula �caerulea Blanch. (pro sp.) var. grandis Blanch. (pro nm.) | big blue birch | Betulaceae
|
| BECA4 | Betula �caerulea Blanch. (pro sp.) | blue birch | Betulaceae
|
| BECA8 | Betula �caerulea-grandis Blanch. | Betula caerulea var. grandis | Betulaceae
|
| BECO4 | Betula �commixta Sarg. | Betula utahensis | Betulaceae
|
| BECO3 | Betula cordifolia Regel | Betula papyrifera var. cordifolia | Betulaceae
|
| BEDU | Betula �dugleana Lepage | | Betulaceae
|
| BEEA | Betula �eastwoodiae Sarg. (pro sp.) | | Betulaceae
|
| BEEX | Betula exilis Sukatschev | Betula nana | Betulaceae
|
| BEFO2 | Betula fontinalis Sarg. | Betula occidentalis | Betulaceae
|
| BEGL2 | Betula glandulifera (Regel) Butler | Betula pumila var. glandulifera | Betulaceae
|
| BEGLG | Betula glandulosa Michx. var. glandulifera (Regel) Gleason | Betula pumila var. glandulifera | Betulaceae
|
| BEGLH | Betula glandulosa Michx. var. hallii (T.J. Howell) C.L. Hitchc. | Betula nana | Betulaceae
|