| Allocarya Greene, 1887 |
| Allocarya mexicana J.F. Macbr., 1919 |
| Amblynotopsis J.F. Macbr., 1916 |
| Amblynotopsis durangensis J.F. Macbr., 1916 |
| Amblynotopsis ebrenbergii Brand, 1925 |
| Amblynotopsis heliotropioides (A. DC.) J.F. Macbr., 1916 |
| Amblynotopsis humilis Brand, 1925 |
| Amblynotopsis linifolia (M. Martens & Galeotti) Brand, 1931 |
| Amblynotopsis paniculata Brand, 1929 |
| Amphibologyne Brand, 1931 |
| Amphibologyne mexicana (M. Martens & Galeotti) Brand, 1931 |
| Amsinckia Lehm., 1831 |
| Amsinckia inepta J.F. Macbr., 1917 |
| Amsinckia intermedia Fisch. & C.A. Mey., 1836 |
| Amsinckia intermedia var. echinata (A. Gray) Wiggins, 1950 |
| Amsinckia media E.H.L. Krause, 1903 |
| Amsinckia menziesii (Lehm.) A. Nelson & J.F. Macbr., 1916 |
| Amsinckia menziesii var. intermedia (Fisch. & C.A. Mey.) Ganders, 1993 |
| Amsinckia mexicana M. Martens & Galeotti, 1844 |
| Amsinckia neomexicana Suksd., 1931 |