| Bidens triplinervia var. macrantha (Wedd.) Sherff, 1925 |
| Bidens triplinervia var. mollis (Poepp.) Sherff, 1925 |
| Bidens triplinervia var. triplinervia Kunth, 1818 |
| Bidens urbanii Greenm., 1907 |
| Bidens verticillata L., 1753 |
| Bidens xanti (A. Gray) B.L. Turner, 2007 |
| Bigelowia DC., 1836 |
| Bigelowia acradenia Greene, 1883 |
| Bigelowia brachylepis A. Gray, 1876 |
| Bigelowia carnosa (A. Gray) A. Gray & Benth. Hook. f., 1873 |
| Bigelowia coronopifolia (A. Gray) A. Gray, 1873 |
| Bigelowia diffusa (Benth.) A. Gray, 1873 |
| Bigelowia hartwegii A. Gray, 1884 |
| Bigelowia intricata A. Gray, 1882 |
| Bigelowia oppositifolia A. Gray, 1880 |
| Bigelowia parishii Greene, 1882 |
| Bigelowia pyramidata B.L. Rob. & Greenm., 1896 |
| Bigelowia tridentata Greene, 1883 |
| Biolettia Greene, 1891 |
| Blainvillea Cass., 1823 |