| Ageratina zapalinama B.L. Turner, 1991 |
| Ageratina zaragozana B.L. Turner, 2014 |
| Ageratina zunilana (Standl. & Steyerm.) R.M. King & H. Rob., 1970 |
| Ageratinae Less., 1832 |
| Ageratum L., 1753 |
| Ageratum adscendens Sch. Bip. ex Hemsl., 1881 |
| Ageratum albidum (DC.) Hemsl., 1881 |
| Ageratum albidum var. albidum (DC.) Hemsl., 1881 |
| Ageratum albidum var. nelsonii B.L. Rob., 1913 |
| Ageratum arbutifolium Kunth, 1818 |
| Ageratum arsenei B.L. Rob., 1922 |
| Ageratum callosum S. Watson, 1889 |
| Ageratum conyzoides L., 1753 |
| Ageratum cordatum (S.F. Blake) L.O. Williams, 1975 |
| Ageratum corymbosum Zucc., 1806 |
| Ageratum corymbosum f. salicifolium (Hemsl.) M.F. Johnson, 1971 |
| Ageratum echioides (Less.) Hemsl., 1881 |
| Ageratum elachycarpum B.L. Rob., 1913 |
| Ageratum elassocarpum S.F. Blake, 1924 |
| Ageratum gaumeri B.L. Rob., 1911 |