| Manihot websteri D.J. Rogers & Appan, 1973 |
| Manihoteae Pax, 1890 |
| Manihotoides D.J. Rogers & Appan, 1973 |
| Manihotoides pauciflora (Brandegee) D.J. Rogers & Appan, 1973 |
| Medea Klotzsch, 1841 |
| Megalostylis S. Moore, 1916 |
| Melanthesopsis Müll. Arg., 1863 |
| Menarda Comm. ex A. Juss., 1824 |
| Mercurialis L., 1753 |
| Mercurialis annua L., 1753 |
| Mercuriastrum Heist. ex Fabr., 1759 |
| Micrandra R. Br., 1844 |
| Micrandreae G.L. Webster, 1975 |
| Microstachys A. Juss., 1824 |
| Microstachys bicornis A. Juss., 1824 |
| Microstachys corniculata (Vahl) Griseb., 1859 |
| Microstachys crotonoides Klotzsch ex Benth., 1854 |
| Microstachys fruticulosa H. Karst., 1862 |
| Microstachys guianensis Klotzsch, 1843 |
| Microstachys micrantha Benth., 1854 |