| Eupatorium molinaei L.O. Williams, 1975 |
| Eupatorium molle Sw., 1788 |
| Eupatorium monanthum Sch. Bip., 1856 |
| Eupatorium monticola L.O. Williams, 1975 |
| Eupatorium morelense B.L. Rob., 1934 |
| Eupatorium morifolium Mill., 1768 |
| Eupatorium muelleri Sch. Bip. ex Klatt, 1884 |
| Eupatorium multinerve Benth., 1841 |
| Eupatorium multiserratum Sch. Bip., 1856 |
| Eupatorium mygindifolium A. Gray, 1880 |
| Eupatorium myriadenium S. Schauer, 1847 |
| Eupatorium naiguatensis (V.M. Badillo) Steyerm., 1978 |
| Eupatorium neaeanum DC., 1836 |
| Eupatorium nelsonii B.L. Rob., 1900 |
| Eupatorium nepetifolium Kunth, 1818 |
| Eupatorium nigrescens Hook. & Arn., 1838 |
| Eupatorium nubigenoides B.L. Rob., 1906 |
| Eupatorium nubigenum Benth., 1841 |
| Eupatorium nubivagum L.O. Williams, 1975 |
| Eupatorium nutans Kunth, 1818 |