| Actinomeris ovata (Cav.) Nutt., 1849 |
| Actinomeris pauciflora Nutt., 1822 |
| Actinomeris pedunculosa DC., 1836 |
| Actinomeris tetragona DC., 1836 |
| Actinomeris tetraptera (Ortega) DC., 1836 |
| Adelmannia Reichb., 1828 |
| Adenocaulinae A. Gray, 1884 |
| Adenocaulon Hook., 1829 |
| Adenocaulon lyratum S.F. Blake, 1934 |
| Adenocritonia R.M. King & H. Rob., 1976 |
| Adenocritonia heathiae (B.L. Turner) R.M. King & H. Rob., 1991 |
| Adenocritonia steyermarkii H. Rob., 1991 |
| Adenopappus Benth., 1840 |
| Adenopappus persicifolius Benth., 1840 |
| Adenophyllum Pers., 1807 |
| Adenophyllum anomalum (Canby & Rose) Strother, 1986 |
| Adenophyllum appendiculatum (Lag.) Strother, 1986 |
| Adenophyllum aurantium (L.) Strother, 1986 |
| Adenophyllum cancellatum (Cass.) Villarreal, 2001 |
| Adenophyllum cancellatum (Cass.) Kuntze, 1891 |