| Muhlenbergia brasiliensis Steud., 1854 |
| Muhlenbergia brevifolia Scribn. ex Beal, 1896 |
| Muhlenbergia brevifolia var. richardsonis (Trin.) M.E. Jones, 1912 |
| Muhlenbergia brevigluma (Scribn.) Columbus, 2010 |
| Muhlenbergia breviligula Hitchc., 1937 |
| Muhlenbergia brevis C.O. Goodd., 1941 |
| Muhlenbergia breviseta Griseb. ex E. Fourn., 1886 |
| Muhlenbergia brevivaginata Swallen, 1958 |
| Muhlenbergia buckleyana Scribn., 1890 |
| Muhlenbergia caespitosa Chapm., 1878 |
| Muhlenbergia calamagrostidea Kunth, 1829 |
| Muhlenbergia capillaris (Lam.) Trin., 1824 |
| Muhlenbergia capillaris var. trichopodes (Elliott) Vasey, 1892 |
| Muhlenbergia capillipes (M.E. Jones) P.M. Peterson & Annable, 1991 |
| Muhlenbergia carinata Mez, 1921 |
| Muhlenbergia cenchroides (Humb. & Bonpl. ex Willd.) P.M. Peterson, 2009 |
| Muhlenbergia ciliata (Kunth) Kunth, 1829 |
| Muhlenbergia ciliata (Kunth) Trin., 1824 |
| Muhlenbergia clomena Kunth, 1829 |
| Muhlenbergia coloradensis Mez, 1921 |