| Ageratina hintonii R.M. King & H. Rob., 1974 |
| Ageratina hintoniorum B.L. Turner, 1984 |
| Ageratina huahuapana B.L. Turner, 2010 |
| Ageratina humochica B.L. Turner, 2007 |
| Ageratina hyssopina (A. Gray) R.M. King & H. Rob., 1970 |
| Ageratina ibaguensis (Sch. Bip.) R.M. King & H. Rob., 1970 |
| Ageratina ilicifolia B.L. Turner, 1991 |
| Ageratina iltisii B.L. Turner, 2012 |
| Ageratina irrasa (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina isolepis (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina jaliscensis (B.L. Rob.) Gage ex B.L. Turner, 1997 |
| Ageratina jalpana B.L. Turner, 1996 |
| Ageratina jalpanserra B.L. Turner, 2014 |
| Ageratina jocotepecana B.L. Turner, 1996 |
| Ageratina josepaneroi B.L. Turner, 1997 |
| Ageratina juxtlahuacensis Panero & Villaseñor, 1998 |
| Ageratina kochiana B.L. Turner, 1992 |
| Ageratina lapsensis B.L. Turner, 2009 |
| Ageratina lasia (B.L. Rob.) R.M. King & H. Rob., 1970 |
| Ageratina lasioneura (Hook. & Arn.) R.M. King & H. Rob., 1972 |