Index of plants by genus
| Species | Common Name | Family |
| Baptisia alba | White Wild Indigo | Fabaceae |
| Baptisia australis | Blue Wild Indigo | Fabaceae |
| Baptisia tinctoria | Yellow Wild Indigo | Fabaceae |
| Bazzania trilobata | Three-lobed Bazzania | Lepidoziaceae |
| Berula erecta | Cutleaf Water Parsnip | Apiaceae |
| Betula allegheniensis | Yellow Birch | Betulaceae |
| Betula cordifolia | Heart-leaved Paper Birch | Betulaceae |
| Betula lenta | Sweet Birch | Betulaceae |
| Betula papyrifera | Paper Birch | Betulaceae |
| Betula populifolia | Gray Birch | Betulaceae |
| Betula pumila | Dwarf Birch | Betulaceae |
| Betula nigra | River Birch | Betulaceae |
| Bidens cernua | Nodding Bur Marigold | Asteraceae |
| Bidens coronata | Tall Swamp Marigold | Asteraceae |
| Bidens frondosa | Common Beggar's Ticks | Asteraceae |
| Boehmeria cylindrica | False Nettle | Urticaceae |
| Botrychium angustisegmentum | Narrow Triangle Moonwort | Ophioglossaceae |
| Botrychium campestre | Prairie Moonwort | Ophioglossaceae |
| Botrychium dissectum | Cutleaf grapefern | Ophioglossaceae |
| Botrychium matricariifolium | Daisy-leaved Moonwort | Ophioglossaceae |
| Botrychium minganense | Mingan Moonwort | Ophioglossaceae |
| Botrychium neolunaria | American Moonwort | Ophioglossaceae |
| Botrychium oneidense | Blunt-lobed Grapefern | Ophioglossaceae |
| Botrychium virginianum | Rattlesnake Fern | Ophioglossaceae |
| Bouteloua curtipendula | Side-oats | Poaceae |
| Brasenia schreberi | Watershield | Cabombaceae |
| Bromus kalmii | Hairy Brome | Poaceae |
| Bryum argenteum | Silvery Bryum | Bryaceae |
| Bryum lisae var. cuspidatum | Bryaceae | |
| Bulbostylis capillaris | Hair Sedge | Cyperaceae |
© 2004-2009 Michael Hough