| Genus | # of species |
|---|---|
| Bismarckia | 1 |
| Bixa | 1 |
| Borassodendron | 1 |
| Brachychiton | 1 |
| Brahea | 2 |
| Brigamia | 1 |
| Bromelia | 2 |
| Bromeliad | 1 |
| Brownea | 2 |
| Browneopis | 1 |
| Brunfelsia | 1 |
| Bunchosia | 1 |
| Burbidgea | 1 |
| Burretiokentia | 4 |
| Butia | 2 |
| Calathea | 4 |
| Calyptrocalyx | 9 |
| Calyptrogyne | 1 |
| Calyptronoma | 1 |
| Cananga | 2 |