| Stachys schiedeana Schltdl., 1832 |
| Stachys stebbinsii G.A. Mulligan & D.B. Munro, 1990 |
| Stachys tamaulipana B.L. Turner, 2013 |
| Stachys tenerrima Epling, 1934 |
| Stachys tlaxiacana B.L. Turner, 2013 |
| Stachys torresii B.L. Turner, 1994 |
| Stachys turneri Rzed. & Calderón, 1995 |
| Stachys venulosa Greene, 1888 |
| Stachys vulnerabilis Rzed. & Calderón, 1988 |
| Subrotundae (Epling) Epling, 1938 |
| Synandreae Raf., 1837 |
| Tectona L. f., 1782 |
| Tectona grandis L. f., 1782 |
| Tectonoideae Bo Li & Olmstead, 2017 |
| Tetraclea A. Gray, 1853 |
| Tetraclea coulteri A. Gray, 1853 |
| Tetraclea coulteri var. subincisa (I.M. Johnst.) Moldenke, 1978 |
| Tetraclea subinclusa I.M. Johnst., 1950 |
| Teucrium L., 1753 |
| Teucrium canadense L., 1753 |