| Maxima Hitchc. & Chase ex Pilg., 1931 |
| Maydinae Harv., 1868 |
| Mays Mill., 1754 |
| Mays americana Baumg., 1816 |
| Mays zea Gaertn., 1788 |
| Mayzea Raf., 1830 |
| Mayzea cerealis Raf., 1830 |
| Mayzea cerealis var. gigantia Raf., 1830 |
| Megastachya P. Beauv., 1812 |
| Megastachya (P. Beauv.) Benth., 1878 |
| Megastachya (P. Beauv.) Benth. |
| Megastachya acutiflora (Kunth) Roem. & Schult., 1817 |
| Megastachya amabilis (L.) P. Beauv., 1812 |
| Megastachya aturensis (Kunth) Roem. & Schult., 1817 |
| Megastachya breviflora E. Fourn., 1886 |
| Megastachya ciliaris (L.) P. Beauv., 1812 |
| Megastachya corymbifera E. Fourn., 1886 |
| Megastachya eragrostis (L.) Roem. & Schult., 1817 |
| Megastachya fasciculata E. Fourn., 1886 |
| Megastachya glomerata (Walter) Schult., 1824 |