| Beloere crispa (L.) Shuttlew. ex A. Gray, 1852 |
| Belotia A. Rich., 1842 |
| Belotia galeottii Turcz., 1846 |
| Belotia grewiifolia A. Rich., 1845 |
| Belotia lessertiana Hochr., 1914 |
| Belotia mexicana (DC.) K. Schum., 1890 |
| 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 |