| Tricarpha durangensis Longpre, 1970 |
| Trichaetolepis Rydb., 1915 |
| Trichapium Gilli, 1983 |
| Trichocoroninae R.M. King & H. Rob., 1980 |
| Trichocoronis A. Gray, 1849 |
| Trichocoronis greggii A. Gray, 1852 |
| Trichocoronis rivularis A. Gray, 1849 |
| Trichocoronis sessilifolia (Schauer) B.L. Rob., 1906 |
| Trichocoronis wrightii (Torr. A. Gray) A. Gray, 1849 |
| Trichocoryne S.F. Blake, 1924 |
| Trichocoryne connata S.F. Blake, 1924 |
| Trichoptilium A. Gray, 1859 |
| Trichoptilium incisum (A. Gray) A. Gray, 1859 |
| Trichospira Kunth, 1818 |
| Trichospira biarista Less., 1829 |
| Trichospira menthoides Kunth, 1818 |
| Trichospira prieurei DC., 1836 |
| Trichospira pulegium Mart. ex DC., 1836 |
| Trichospira verticillata (L.) S.F. Blake, 1915 |
| Trichospirinae Less., 1831 |