| Mulgedium pulchellum (Pursh) G. Don, 1839 |
| Mustelia Spreng., 1802 |
| Mustelia eupatoria Spreng., 1801 |
| Mutisieae Cass., 1819 |
| Mutisiinae (Cass.) Dumort. |
| Mutisioideae Lindl., 2004 |
| Nahuatlea V.A. Funk, 2017 |
| Nahuatlea arborescens (Brandegee) V.A. Funk, 2017 |
| Nahuatlea hiriartiana (Medrano, Villaseñor & Medina) V.A. Funk, 2017 |
| Nahuatlea hypoleuca (DC.) V.A. Funk, 2017 |
| Nahuatlea magna (M.C. Johnst. ex Cabrera) V.A. Funk, 2017 |
| Nahuatlea obtusata (S.F. Blake) V.A. Funk, 2017 |
| Nahuatlea purpusii (Brandegee) V.A. Funk, 2017 |
| Nahuatlea smithii (B.L. Rob. & Greenm.) V.A. Funk, 2017 |
| Nassauvieae Cass., 1819 |
| Neilreichia Fenzl, 1849 |
| Neilreichia eupatorioides Fenzl, 1850 |
| Nelsonianthus H. Rob. & Brettell, 1973 |
| Nelsonianthus epiphyticus H. Rob. & Brettell, 1973 |
| Nelsonianthus tapianus (B.L. Turner) C. Jeffrey, 1992 |