| Calamagrostis mexicana Kunth, 1825 |
| Calamagrostis montevidensis Nees, 1829 |
| Calamagrostis orizabae (Rupr. ex E. Fourn.) Beal, 1896 |
| Calamagrostis orizabae Steud., 1854 |
| Calamagrostis pinetorum Swallen, 1950 |
| Calamagrostis plumosa (E. Fourn.) Scribn. ex Beal, 1896 |
| Calamagrostis poaeformis (Kunth) Beal, 1896 |
| Calamagrostis poaeoides Trin. ex Steud., 1840 |
| Calamagrostis poiformis (Kunth) Beal, 1896 |
| Calamagrostis poioides Steud., 1854 |
| Calamagrostis pringlei Scribn. ex Beal, 1896 |
| Calamagrostis purpurascens R. Br., 1823 |
| Calamagrostis purpurascens subsp. maltei (Polunin) A.E. Porsild, 1974 |
| Calamagrostis purpurascens subsp. purpurascens R. Br., 1823 |
| Calamagrostis purpurascens var. arctica (Vasey) Kearney, 1898 |
| Calamagrostis purpurascens var. maltei Polunin, 1940 |
| Calamagrostis purpurascens var. ophitidis J.T. Howell, 1946 |
| Calamagrostis purpurascens var. purpurascens R. Br., 1823 |
| Calamagrostis purpurascens var. vaseyi (Beal) M.E. Jones, 1912 |
| Calamagrostis quitensis Kunth, 1815 |