| Tagetes signata Bartl., 1837 |
| Tagetes silenoides Meyen & Walp., 1843 |
| Tagetes sororia Standl. & Steyerm., 1944 |
| Tagetes stenophylla B.L. Rob., 1907 |
| Tagetes subulata Cerv., 1824 |
| Tagetes subvillosa Lag., 1816 |
| Tagetes tenuifolia Cav., 1793 |
| Tagetes terniflora Kunth, 1818 |
| Tagetes tinctoria Hornsch., 1845 |
| Tagetes triradiata Greenm., 1897 |
| Tagetes wislizeni A. Gray, 1849 |
| Tagetes zypaquirensis Bonpl., 1809 |
| Tagetinae Dumort., 1829 |
| Tamaulipa R.M. King & H. Rob., 1971 |
| Tamaulipa azurea (DC.) R.M. King & H. Rob., 1971 |
| Tanacetum L., 1753 |
| Tanacetum bajacalifornicum Moran, 1969 |
| Tanacetum martirense Wiggins, 1965 |
| Tanacetum parthenium (L.) Sch. Bip., 1844 |
| Taraxacum F.H. Wigg., 1780 |