| Calophanes quadrangularis Oerst., 1855 |
| Calophanes schiedeanus Nees, 1847 |
| Cardiacanthus Nees & Schauer, 1847 |
| Cardiacanthus fragrans Lindau, 1899 |
| Cardiacanthus neesianus Schauer ex Nees, 1847 |
| Cardiacanthus tetramerioides Lindau, 1899 |
| Carlowrightia A. Gray, 1878 |
| Carlowrightia albiflora T.F. Daniel, 1983 |
| Carlowrightia angustifolia Brandegee, 1906 |
| Carlowrightia arizonica A. Gray, 1878 |
| Carlowrightia californica Brandegee, 1903 |
| Carlowrightia californica var. pallida I.M. Johnst., 1924 |
| Carlowrightia cordifolia A. Gray, 1886 |
| Carlowrightia costaricana Leonard, 1938 |
| Carlowrightia coyucana Leonard, 1938 |
| Carlowrightia fimbriata Brandegee, 1891 |
| Carlowrightia fuertensis T.F. Daniel, 1988 |
| Carlowrightia glabrata Fernald, 1895 |
| Carlowrightia glandulosa B.L. Rob. & Greenm., 1896 |
| Carlowrightia hapalocarpa B.L. Rob. & Greenm., 1894 |