| Agave (Agave) cerulata subsp. subcerulata Gentry, 1978 |
| Agave (Agave) cerulata var. nelsonii (Gentry) R.H. Webb & G.D. Starr, 2015 |
| Agave (Agave) chihuahuana Trel., 1911 |
| Agave (Agave) coarctata Jacobi, 1868 |
| Agave (Agave) coccinea Roezl ex Jacobi, 1865 |
| Agave (Agave) cochlearis Jacobi, 1869 |
| Agave (Agave) colorata Gentry, 1942 |
| Agave (Agave) complicata Trel. ex Ochot., 1913 |
| Agave (Agave) compluviata Trel., 1914 |
| Agave (Agave) congesta Gentry, 1982 |
| Agave (Agave) conjuncta A. Berger, 1915 |
| Agave (Agave) connochaetodon Trel., 1911 |
| Agave (Agave) consociata Trel., 1911 |
| Agave (Agave) corderoyi Baker, 1877 |
| Agave (Agave) crassispina Trel., 1914 |
| Agave (Agave) crassispina var. culta Trel., 1920 |
| Agave (Agave) crenata Jacobi, 1866 |
| Agave (Agave) cupreata Trel. & A. Berger, 1915 |
| Agave (Agave) datylio F.A.C. Weber, 1902 |
| Agave (Agave) datylio var. datylio F.A.C. Weber, 1902 |