| Thyrsanthema nutans (L.) Kuntze, 1891 |
| Thyrsanthema runcinata (Kunth) Kuntze, 1891 |
| Thyrsanthema seemannii (Sch. Bip.) Kuntze, 1891 |
| Thyrsanthema spathulata (D. Don) Kuntze, 1891 |
| Thyrsanthema tomentosa (L. f.) Kuntze, 1891 |
| Timanthea Salisb., 1796 |
| Timanthea tristis Salisb., 1796 |
| Tithonia Desf. ex Juss., 1789 |
| Tithonia angustifolia Hook. & Arn., 1841 |
| Tithonia auriculata (Brandegee) S.F. Blake, 1918 |
| Tithonia brachypappa B.L. Rob., 1892 |
| Tithonia calva Sch. Bip., 1856 |
| Tithonia calva var. auriculata (Brandegee) La Duke, 1982 |
| Tithonia calva var. calva Sch. Bip., 1856 |
| Tithonia calva var. lancifolia (B.L. Rob. & Greenm.) McVaugh, 1972 |
| Tithonia decurrens A. Gray, 1849 |
| Tithonia diversifolia (Hemsl.) A. Gray, 1883 |
| Tithonia fruticosa Canby & Rose, 1891 |
| Tithonia glaberrima Kuntze, 1891 |
| Tithonia helianthoides Weinm. ex Steud., 1841 |