| 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 |
| Baccharis androgyna Brandegee, 1914 |
| Baccharis asperifolia Benth., 1841 |
| Baccharis bigelovii A. Gray, 1859 |
| Baccharis brachyphylla A. Gray, 1853 |
| Baccharis braunii (Pol.) Standl., 1938 |
| Baccharis brevipappa (McVaugh) G.L. Nesom, 1972 |