| Melinis rosea (Nees) Hack., 1901 |
| Meoschium P. Beauv., 1812 |
| Meoschium rugosum (Salisb.) Nees, 1843 |
| Merathrepta Raf., 1830 |
| Merathrepta pinetorum (Piper) Piper, 1906 |
| Merathrepta spicata Raf. ex B.D. Jacks., 1894 |
| Merathrepta thermale (Scribn.) A. Heller, 1909 |
| Merathrepta thermale var. pinetorum (Piper) Piper ex Fedde & Schuster, 1911 |
| Merisachne Steud., 1854 |
| Merisachne drummondii Steud., 1854 |
| Merostachys Spreng., 1824 |
| Merostachys mexicana Ruiz-Sanchez & L.G. Clark, 2018 |
| Merostachys racemiflora (Steud.) E. Fourn., 1886 |
| Mesosetum Steud., 1855 |
| Mesosetum angustifolium (Swallen) Swallen, 1933 |
| Mesosetum blakei Swallen, 1937 |
| Mesosetum filifolium F.T. Hubb., 1913 |
| Mesosetum pittieri Hitchc., 1927 |
| Mesosetum stoloniferum Swallen, 1950 |
| Mesosetum tabascoënse Beetle, 1977 |