| Castilleja stipifolia G.L. Nesom, 1992 |
| Castilleja subalpina Eastw., 1909 |
| Castilleja tancitaroana G.L. Nesom, 1992 |
| Castilleja tapeinoclada Loes., 1903 |
| Castilleja tenuiflora Benth., 1839 |
| Castilleja tenuiflora var. tancitaroana (G.L. Nesom) J.M. Egger, 2008 |
| Castilleja tenuiflora var. tenuiflora Benth., 1839 |
| Castilleja tenuiflora var. xylorrhiza (Eastw.) G.L. Nesom, 1992 |
| Castilleja tenuifolia M. Martens & Galeotti, 1845 |
| Castilleja tenuifolia subsp. tenuifolia M. Martens & Galeotti, 1845 |
| Castilleja tolucensis Kunth, 1818 |
| Castilleja tomentosa A. Gray, 1859 |
| Castilleja venusta Rzed., 1975 |
| Castilleja zempoaltepetlensis G.L. Nesom, 1992 |
| Chloropyron Behr, 1855 |
| Chloropyron maritimum (Nutt. ex Benth.) A. Heller, 1907 |
| Chloropyron maritimum subsp. maritimum (Nutt. ex Benth.) A. Heller, 1907 |
| Clevelandia Greene, 1885 |
| Clevelandia beldingii (Greene) Greene, 1885 |
| Conopholis Wallr., 1825 |