| Anaitis acapulcensis DC., 1836 |
| Anaphalis DC., 1838 |
| Anaphalis aecidiocephala Grierson, 1972 |
| Anaphalis concinna (A. Gray) Grierson, 1972 |
| Anaphalis margaritacea (L.) Benth. & Hook. f., 1873 |
| Ancistrocarphus A. Gray, 1868 |
| Ancistrocarphus filagineus A. Gray, 1868 |
| Ancistrophora A. Gray, 1859 |
| Andrieuxia DC., 1836 |
| Andromachia Bonpl., 1809 |
| Andromachia deppeana Less., 1831 |
| Anisocoma Torr. & A. Gray, 1845 |
| Anisocoma acaulis Torr. & A. Gray, 1845 |
| Anomostephium DC., 1836 |
| Antennaria Gaertn., 1791 |
| Antennaria argentea (Gray) Benth., 1849 |
| Antennaria dioica (L.) Gaertn., 1791 |
| Antennaria formosa Greene, 1905 |
| Antennaria geyeri A. Gray, 1849 |
| Antennaria holmii Greene, 1899 |