| Astranthium xylopodum Larsen, 1933 |
| Athanasiinae Lindl. Pfeiff., 1873 |
| Athronia Neck., 1790 |
| Atrichoseris A. Gray, 1884 |
| Atrichoseris platyphylla (A. Gray) A. Gray, 1884 |
| Axiniphyllum Benth., 1872 |
| Axiniphyllum corymbosum Benth., 1872 |
| Axiniphyllum durangense B.L. Turner, 1987 |
| Axiniphyllum pinnatisectum (Paul G. Wilson) B.L. Turner, 1978 |
| Axiniphyllum sagittalobum B.L. Turner, 1978 |
| Axiniphyllum scabrum (Zucc.) S.F. Blake, 1930 |
| Ayapaninae R.M. King & H. Rob., 1980 |
| Aztecaster G.L. Nesom, 1993 |
| Aztecaster matudae (Rzed.) G.L. Nesom, 1993 |
| Aztecaster pyramidatus (B.L. Rob. & Greenm.) G.L. Nesom, 1993 |
| Baccharidinae Less., 1830 |
| Baccharis L., 1753 |
| Baccharis adnata Kunth ex Willd., 1809 |
| Baccharis alamanii DC., 1836 |
| Baccharis alamosana S.F. Blake, 1924 |