| Calamagrostis tenuifolia Kunth, 1815 |
| Calamagrostis tolucensis (Kunth) Trin. ex Steud., 1840 |
| Calamagrostis valida Sohns, 1956 |
| Calamagrostis variegata With., 1796 |
| Calamagrostis vaseyi Beal, 1896 |
| Calamagrostis viridiflavescens (Poir.) Steud., 1840 |
| Calamagrostis viridiflavescens var. montevidensis (Nees) Kämpf, 1974 |
| Calamagrostis vulcanica Swallen, 1953 |
| Calamagrostis willdenowii (Trin.) Steud., 1854 |
| Calamagrostis wiluica Litv. ex Petrov, 1930 |
| Calamochloa E. Fourn., 1877 |
| Calamochloa filifolia E. Fourn., 1977 |
| Calamochloe Rchb., 1828 |
| Calanthera Hook., 1856 |
| Calanthera dactyloides (Nutt.) Kunth ex Hook., 1856 |
| Calosteca Desv., 1810 |
| Calothecinae Soreng, 2015 |
| Calotheria Steud., 1854 |
| Calycodon Nutt., 1848 |
| Calycodon montanum Nutt., 1848 |