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| Common Name | Scientific Name | |
| Bachelor's Buttons | Centaurea cyanus | |
| Balm, Field | Calamintha nepeta | |
| Balloonvine | Cardiospermum halicacabum | |
| Bamboo, Japanese | Polygonum cuspidatum | |
| Barley, Little | Hordeum pusillum | |
| Barnyardgrass | Echinochloa crus-galli | |
| Basil, Wild | Satureja vulgaris | |
| Basketgrass | Microstegium vimineum | |
| Bear-grass | Yucca filamentosa | |
| Bearsfoot | Smallanthus uvedalia | |
| Bedstraw, Smooth | Galium mollugo | |
| Bee-balm | Monarda fistulosa | |
| Beef-steak Plant | Perilla frutescens | |
| Beggarticks, Coreopsis | Bidens polylepis | |
| Beggarticks, Devils | Bidens frondosa | |
| Beggarweed, Florida | Desmodium tortuosum | |
| Bergamot, Wild | Monarda fistulosa | |
| Bermudagrass | Cynodon dactylon | |
| Berry, Coral | Symphoricarpos orbiculatus | |
| Bigroot Morningglory | Ipomoea pandurata | |
| Bindweed, Field | Convolvulus arvensis | |
| Bindweed, Hedge | Calystegia sepium | |
| Birdsfoot Trefoil | Lotus corniculatus | |
| Bittercress, Hairy | Cardamine hirsuta | |
| Bittersweet Nightshade | Solanum dulcamara | |
| Black Locust | Robinia pseudoacacia | |
| Black Nightshade | Solanum nigrum | |
| Black Medic | Medicago lupulina | |
| Blackseed Plantain | Plantago rugelii | |
| Bladder Campion | Silene vulgaris | |
| Bladderworts | Utricularia spp. | |
| Bloodroot | Sanguinaria canadensis | |
| Blue-Bottles | Muscari racemosum | |
| Bluegrass, Annual | Poa annua | |
| Bluegrass, Roughstalk | Poa trivialis | |
| Blue Phlox | Phlox divaricata | |
| Blueweed | Echium vulgare | |
| Bouncingbet | Saponaria officinalis | |
| Brambles | Rubus spp. | |
| Brazilian Elodea | Egeria densa | |
| Brittleleaf Naiad | Najas minor | |
| Broadleaf Dock | Rumex obtusifolius | |
| Broadleaf Plantain | Plantago major | |
| Broadleaf Signalgrass | Brachiaria platyphylla | |
| Brome, Downy | Bromus tectorum | |
| Broomsedge | Andropogon virginicus | |
| Browntop Millet | Brachiaria ramosa | |
| Buckbrush | Symphoricarpos orbiculatus | |
| Buckhorn Plantain | Plantago lanceolata | |
| Buckwheat, Wild | Polygonum convolvulus | |
| Bulbous Tall Oatgrass | Arrhenatherum elatius var. bulbosa | |
| Bull Thistle | Cirsium vulgare | |
| Buffalobur | Solanum rostratum | |
| Burcucumber | Sicyos angulatus | |
| Burdock, Common | Arctium minus | |
| Burweed, Lawn | Soliva pterosperma | |
| Buttercup, Bulbous | Ranunculus bulbosus | |
| Buttercup, Corn | Ranunculus arvensis | |
| Buttercup, Smallflower | Ranunculus abortivus | |
| Butterfly Milkweed | Asclepias tuberosa | |
| Buttonweed, Common | Diodia teres | |
| Buttonweed, Virginia | Diodia virginiana |
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