| Syntherisma sanguinalis var. pruriens (Fisch. ex Trin.) Honda, 1930 |
| Syntherisma setosa (Desv. ex Ham.) Nash, 1898 |
| Syntherisma ternata (Hochst. ex A. Rich.) Newbold, 1924 |
| Syntherisma velutinum (DC.) Chase, 1906 |
| Syntherisma velutinum subsp. glabella Chase, 1913 |
| Syntherisma velutinum subsp. velutina (DC.) Chase, 1906 |
| Syntherisma villosa Walter, 1788 |
| Syntherisma violascens (Link) Nash, 1909 |
| Syntherisma vulgare Schrad., 1806 |
| Syntherisma vulgaris Schrad., 1806 |
| Talasium Spreng., 1827 |
| Tema Adans., 1763 |
| Terrellia Lunell, 1915 |
| Terrellia canadensis (L.) Lunell, 1915 |
| Terrellia canadensis var. glaucifolia (Willd.) Lunell ex Hitchc., 1935 |
| Terrellia diversiglumis (Scribn. & C.R. Ball) Lunell, 1915 |
| Terrellia glauca (Buckley) Lunell, 1915 |
| Tetragonocalamus Nakai, 1933 |
| Tetrapogon Desf., 1800 |
| Tetrapogon brandegeei (Vasey) P.M. Peterson, 2015 |