| Castilleja lebgueana G.L. Nesom, 1994 |
| Castilleja linifolia N.H. Holmgren, 1976 |
| Castilleja lithospermoides Kunth, 1817 |
| Castilleja longibracteata M. Martens & Galeotti, 1845 |
| Castilleja longiflora Kunze, 1842 |
| Castilleja macrostigma B.L. Rob., 1891 |
| Castilleja madrigalii C. Medina & E. Carranza, 2017 |
| Castilleja martini Abrams, 1902 |
| Castilleja mcvaughii N.H. Holmgren, 1976 |
| Castilleja mexicana (Hemsl.) A. Gray, 1886 |
| Castilleja minor (A. Gray) A. Gray, 1876 |
| Castilleja moranensis Kunth, 1818 |
| Castilleja nelsonii Eastw., 1909 |
| Castilleja nervata Eastw., 1909 |
| Castilleja nitricola Eastw., 1909 |
| Castilleja nivibractea G.L. Nesom, 1995 |
| Castilleja obovata Benth., 1846 |
| Castilleja ophiocephala Tank & J.M.Egger, 2009 |
| Castilleja ornata Eastw., 1909 |
| Castilleja ortegae Standl., 1936 |