| Tricholaena tonsa Nees, 1835 |
| Trichoneura Andersson, 1855 |
| Trichoneura elegans Swallen, 1932 |
| Trichoon Roth, 1798 |
| Trichoon phragmites (L.) Rendle, 1899 |
| Trichopyrum Á. Löve, 1986 |
| Trichopyrum intermedium (Host) Á. Löve, 1986 |
| Tricoforeas É. Desv., 1854 |
| Tricuspis P. Beauv., 1812 |
| Tricuspis (Triplasis) (P. Beauv.) A. Gray, 1848 |
| Tridens Roem. & Schult., 1817 |
| Tridens albescens (Vasey) N.T. Burb., 1946 |
| Tridens albescens (Vasey) Wooton & Standl., 1912 |
| Tridens ambiguus (Elliott) Schult., 1824 |
| Tridens avenaceus (Kunth) Hitchc., 1913 |
| Tridens avenaceus var. avenaceus (Kunth) Hitchc., 1913 |
| Tridens duartei Catasús, 1980 |
| Tridens eragrostoides (Vasey & Scribn.) Nash, 1903 |
| Tridens flavus (L.) Hitchc., 1906 |
| Tridens flavus f. cuprea (Jacq.) Fosberg, 1957 |