| Baccharis | Asteraceae |
| Ballota | Lamiaceae |
| Balsamita | Asteraceae |
| Baptisia | Fabaceae |
| Barbarea | Brassicaceae |
| Bartonia | Gentianaceae |
| Bassia | Chenopodiaceae |
| Beckmannia | Poaceae |
| Belamcanda | Iridaceae |
| Bellis | Asteraceae |
| Berberis | Berberidaceae |
| Berteroa | Brassicaceae |
| Beta | Chenopodiaceae |
| Betula | Betulaceae |
| Bidens | Asteraceae |
| Blephilia | Lamiaceae |
| Boehmeria | Urticaceae |
| Bolboschoenus | Cyperaceae |
| Boltonia | Asteraceae |
| Borago | Boraginaceae |
| Botrychium | Ophioglossaceae |
| Bouteloua | Poaceae |
| Brachyactis | Asteraceae |
| Brachyelytrum | Poaceae |
| Brachypodium | Poaceae |
| Brasenia | Cabombaceae |
| Brassica | Brassicaceae |
| Braya | Brassicaceae |
| Briza | Poaceae |
| Bromus | Poaceae |
| Broussonetia | Moraceae |
| Browallia | Solanaceae |
| Buddleja | Buddlejaceae |
| Buglossoides | Boraginaceae |
| Bulbostylis | Cyperaceae |
| Bunias | Brassicaceae |
| Bupleurum | Apiaceae |
| Butomus | Butomaceae |
Last Update: 1/6/97
Name: Ray Phillips
Email: rbphilli@Colby.edu