| Mallinoa corymbosa J.M. Coult., 1895 |
| Malperia S. Watson, 1889 |
| Malperia tenuis S. Watson, 1889 |
| Margacola Buckley, 1861 |
| Marshalljohnstonia Henrickson, 1976 |
| Marshalljohnstonia gypsophila Henrickson, 1977 |
| Maruta (Cass.) Gray, 1821 |
| Maruta cotula (L.) DC., 1837 |
| Maruta foetida Cass., 1823 |
| Matamoria La Llave & Lex., 1824 |
| Matamoria spicata La Llave, 1824 |
| Matricaria L., 1753 |
| Matricaria chamomilla L., 1753 |
| Matricaria chamomilla var. recutita (L.) Grierson, 1974 |
| Matricaria coronaria (L.) Desr., 1791 |
| Matricaria courrantiana DC., 1837 |
| Matricaria discoidea DC., 1837 |
| Matricaria inodora L., 1755 |
| Matricaria matricarioides (Less.) Porter ex Britton, 1894 |
| Matricaria occidentalis Greene, 1886 |