| Machaeranthera tanacetifolia (Kunth) Nees, 1832 |
| Machaeranthera tenuis (S. Watson) B.L. Turner & D.B. Horne, 1964 |
| Machaeranthera tephrodes Greene, 1899 |
| Machaeranthera turneri M.L. Arnold & R.C. Jacks., 1978 |
| Machaeranthera wigginsii (S.F. Blake) R.L. Hartm., 1990 |
| Machaerantherinae G.L. Nesom, 1994 |
| Macrocarphus Nutt., 1841 |
| Macrorhynchus Less., 1832 |
| Macrorhynchus heterophyllus Nutt., 1841 |
| Macvaughiella R.M. King & H. Rob., 1968 |
| Macvaughiella chiapensis R.M. King & H. Rob., 1991 |
| Macvaughiella mexicana (Sch. Bip.) R.M. King & H. Rob., 1968 |
| Macvaughiella oaxacensis R.M. King & H. Rob., 1991 |
| Macvaughiella standleyi (Steyerm.) R.M. King & H. Rob., 1968 |
| Madia Molina, 1781 |
| Madia densifolia Greene, 1897 |
| Madia elegans D. Don ex Lindl., 1831 |
| Madia elegans var. densifolia (Greene) Jeps., 1901 |
| Madia elegans var. elegans D. Don ex Lindl., 1831 |
| Madia exigua (Sm.) A. Gray, 1872 |