| Calyptrocarya glomerulata (Brongn.) C.B. Clarke, 1900 |
| Calyptrocarya palmetto Nees, 1842 |
| Carex L., 1753 |
| Carex acrolepis Liebm., 1850 |
| Carex agrostoides Mack., 1907 |
| Carex albicans Willd. ex Spreng., 1826 |
| Carex albicans var. australis (L.H. Bailey) Rettig, 1990 |
| Carex albicans var. emmonsii (Dewey ex Torr.) Rettig, 1990 |
| Carex albolutescens Schwein., 1824 |
| Carex alma L.H. Bailey, 1889 |
| Carex androgyna L.H. Bailey, 1886 |
| Carex angustata Boott, 1839 |
| Carex angustilepis Reznicek & S. González, 2021 |
| Carex angustior Mack., 1917 |
| Carex angustispica Reznicek & S. González, 2001 |
| Carex anisostachys Liebm., 1850 |
| Carex arizonensis C.B. Clarke, 1908 |
| Carex arizonica Licher, G. Rink & Reznicek, 2018 |
| Carex arsenei Kük., 1910 |
| Carex asynchrona Naczi, 1989 |