| Chaptalia subcordata Greene, 1906 |
| Chaptalia texana Greene, 1906 |
| Chaptalia transiliens G.L. Nesom, 1984 |
| Cheilodiscus Triana, 1858 |
| Chihuahuana Urbatsch & R.P. Roberts, 2004 |
| Chihuahuana purpusii (Brandegee) Urbatsch & R.P. Roberts, 2004 |
| Chiliophyllum DC., 1836 |
| Chiliophyllum globosum (Ortega) DC., 1836 |
| Chionolaena DC., 1836 |
| Chionolaena aecidiocephala (Grierson) Anderb. & S.E. Freire, 1989 |
| Chionolaena concinna (A. Gray) Anderb. & S.E. Freire, 1989 |
| Chionolaena corymbosa Hemsl., 1879 |
| Chionolaena cryptocephala (G.L. Nesom) G.L. Nesom, 2001 |
| Chionolaena durangensis (G.L. Nesom) G.L. Nesom, 2001 |
| Chionolaena eleagnoides Klatt, 1887 |
| Chionolaena lavandulifolia (Kunth) Benth. & Hook. f. ex B.D. Jacks., 1893 |
| Chionolaena macdonaldii (G.L. Nesom) G.L. Nesom, 2001 |
| Chionolaena mexicana S.E. Freire, 1993 |
| Chionolaena salicifolia (Bertol.) G.L. Nesom, 2001 |
| Chionolaena sartorii Klatt, 1887 |