| Carex fuscotincta Mack., 1909 |
| Carex galbana L.H. Bailey, 1898 |
| Carex galeottiana C.A. Mey., 1842 |
| Carex gayana Desv., 1854 |
| Carex gayana var. hyalina L.H. Bailey, 1886 |
| Carex geophila Mack., 1913 |
| Carex globosa Boott, 1846 |
| Carex gypsophila Reznicek & S. González, 2021 |
| Carex halleriana Asso, 1779 |
| Carex halleriana subsp. planostachys Kunze ex Kük., 1909 |
| Carex hamata Sw., 1788 |
| Carex hartwegii Boott, 1842 |
| Carex hassei L.H. Bailey, 1896 |
| Carex heptastachya Boeckeler, 1875 |
| Carex hermannii Cochrane, 1981 |
| Carex hermaphrodita Jacq., 1790 |
| Carex hirtella (Sw.) J.F. Gmel., 1791 |
| Carex huehueteca Standl. & Steyerm., 1947 |
| Carex hultenii Aspl., 1954 |
| Carex humboldtiana Steud., 1855 |