| Castilleja Mutis ex L. f., 1782 |
| Castilleja affinis Hook. & Arn., 1833 |
| Castilleja affinis var. minor A. Gray, 1859 |
| Castilleja agrestis Pennell, 1953 |
| Castilleja albobarbata Iltis & G.L. Nesom, 2003 |
| Castilleja altorum Standl. & Steyerm., 1944 |
| Castilleja angustata (B.L. Rob. & Seaton) Eastw., 1909 |
| Castilleja angustifolia M. Martens & Galeotti, 1845 |
| Castilleja angustifolia (Nutt.) G. Don, 1838 |
| Castilleja angustifolia var. dubia A. Nelson, 1902 |
| Castilleja applegatei Fernald, 1898 |
| Castilleja arvensis Schltdl. & Cham., 1830 |
| Castilleja aspera Eastw., 1909 |
| Castilleja attenuata (A. Gray) T.I. Chuang & Heckard, 1991 |
| Castilleja aurea B.L. Rob. & Greenm., 1896 |
| Castilleja auriculata Eastw., 1909 |
| Castilleja auriculata var. auriculata Eastw., 1909 |
| Castilleja auriculata var. verecunda G.L. Nesom, 1992 |
| Castilleja beldingii (Greene) Tank & J.M. Egger, 2009 |
| Castilleja bella Standl., 1940 |