| Muhlenbergia filiformis var. fortis E.H. Kelso, 1936 |
| Muhlenbergia firma Beal, 1896 |
| Muhlenbergia flavida Vasey, 1893 |
| Muhlenbergia flaviseta Scribn., 1897 |
| Muhlenbergia fournieriana Hitchc., 1933 |
| Muhlenbergia fragilis Swallen, 1947 |
| Muhlenbergia geminiflora (Kunth) P.M. Peterson, 2010 |
| Muhlenbergia gigantea (E. Fourn.) Hitchc., 1935 |
| Muhlenbergia glabrata (Kunth) Trin., 1824 |
| Muhlenbergia glauca (Nees) B.D. Jacks., 1895 |
| Muhlenbergia glauca (Nees) Mez, 1921 |
| Muhlenbergia gooddingii Soderstr., 1967 |
| Muhlenbergia gracilis (Kunth) Trin., 1824 |
| Muhlenbergia gracilis var. breviaristata Vasey, 1874 |
| Muhlenbergia gracilis var. enervis Scribn. ex Beal, 1896 |
| Muhlenbergia gracilis var. major Vasey, 1878 |
| Muhlenbergia gracillima Torr., 1857 |
| Muhlenbergia grandis Vasey, 1893 |
| Muhlenbergia gypsophila Reeder & C. Reeder, 1966 |
| Muhlenbergia herzogiana Henrard, 1921 |