| Tridax palmeri A. Gray, 1879 |
| Tridax palmeri var. palmeri A. Gray, 1879 |
| Tridax paneroi B.L. Turner, 2012 |
| Tridax petrophila B.L. Rob. & Greenm., 1896 |
| Tridax platyphylla B.L. Rob., 1907 |
| Tridax procumbens L., 1753 |
| Tridax purpurea S.F. Blake, 1937 |
| Tridax purpusii Brandegee, 1913 |
| Tridax rosea Sch. Bip. ex B.L. Rob. & Greenm., 1896 |
| Tridax serboana B.L. Turner, 2008 |
| Tridax tamaulipana B.L. Turner, 2016 |
| Tridax tenuifolia Rose, 1895 |
| Tridax trilobata (Cav.) Hemsl., 1881 |
| Tridax yecorana B.L. Turner, 1996 |
| Trigonospermum Less., 1832 |
| Trigonospermum adenostemmoides Less., 1832 |
| Trigonospermum alexandri Rzed. Calderón & Pérez-Calix, 2008 |
| Trigonospermum annuum McVaugh & Lask., 1972 |
| Trigonospermum auriculatum B.L. Turner, 1978 |
| Trigonospermum blakei McVaugh & Lask., 1972 |