Berseem _Trifolium alexandrinum_ 34 Berula _Berula_ 37 Betony _Stachys_ 53 Bindweed _Convolvulus_ 40 Birch _Betula_ 56 Birdwoodgrass _Cenchrus setigerus_ 20 Bittercress _Cardamine_ 38 Bittersweet _Celastrus_ 56 Bitterweed _Hymenoxys odorata_ 45 Blackberry _Rubus_ 58 Blackberrylily _Belamcanda_ 29 Blackeyedsusan _Rudbeckia hirta_ 51 Blackfoot _Melampodium_ 47 Bladderfern _Cystopteris_ 28 Bladdernut _Staphylea_ 59 Bladderpod _Lesquerella_ 46 Bladderwort _Utricularia_ 54 Bloodroot _Sanguinaria_ 52 Blowoutgrass _Redfieldia_ 25 Blue-eyedgrass _Sisyrinchium_ 30 Bluegrass _Poa_ 24 Bluehearts _Buchnera_ 38 Bluestem _Andropogon_; _Bothriochloa_ 18 Bluets _Houstonia_ 44 Blueweed _Echium vulgare_ 41 Boltonia _Boltonia_ 38 Boneset _Eupatorium perfoliatum_ 42 Bottlebrushgrass _Hystrix_ 22 Bouncingbet _Saponaria officinalis_ 52 Boxelder _Acer negundo_ 55 Bracken _Pteridium_ 28 Brickellia _Brickellia_ 38 Bristlegrass _Setaria_ 25 Broadbean _Vicia faba_ 34 Brome _Bromus_ 19 Broom _Cytisus_ 31, 56 Broomcorn _Sorghum bicolor_ var. _technicum_ 25 Broomrape _Orobanche_ 49 Broomsedge _Andropogon virginicus_ 18 Broomweed _Gutierrezia dracunculoides_ 43 Browneyedsusan _Rudbeckia triloba_ 51 Browntopmillet _Panicum ramosum_ 23