| Belotia reticulata Sprague, 1921 |
| Belotia tabascana Sprague, 1921 |
| Bernoullia Oliv., 1873 |
| Bernoullia flammea Oliv., 1873 |
| Bernoullia jaliscana Miranda & McVaugh, 1962 |
| Bernoullieae Carv.-Sobr., 2016 |
| Berrya Roxb., 1820 |
| Berrya cubensis (Griseb.) M. Gómez, 1890 |
| Billieturnera Fryxell, 1982 |
| Billieturnera helleri (Rose ex C. Heller) Fryxell, 1982 |
| Bogenhardia Rchb., 1841 |
| Bogenhardia crispa (L.) Kearney, 1954 |
| Bombaceae Kunth, 1824 |
| Bombacoideae Burnett, 1835 |
| Bombacopsis Pittier, 1916 |
| Bombax L., 1753 |
| Bombax aesculifolium Kunth, 1821 |
| Bombax ceiba L., 1753 |
| Bombax ellipticum Kunth, 1822 |
| Bombax mexicanum Hemsl., 1878 |