| Aster oolentangiensis Riddell, 1835 |
| Aster palmeri A. Gray, 1882 |
| Aster parviflorus (A. Gray) A. Gray, 1876 |
| Aster parvulus S.F. Blake, 1925 |
| Aster pauciflorus Nutt., 1818 |
| Aster pinnatifidus (Hook.) Kuntze, 1891 |
| Aster pinnatus Cav., 1794 |
| Aster potosinus A. Gray, 1880 |
| Aster procumbens Houst. ex Mill., 1768 |
| Aster riparius Kunth, 1818 |
| Aster schaffneri Sch. Bip. ex S.D. Sundb. & A.G. Jones, 1986 |
| Aster sonorae A. Gray, 1853 |
| Aster sonoriensis (A. Gray) Kuntze, 1891 |
| Aster spathulatus Lindl., 1834 |
| Aster spinosus Benth., 1839 |
| Aster spinosus var. jaliscensis McVaugh, 1972 |
| Aster subulatus Michx., 1803 |
| Aster subulatus var. subulatus Michx., 1803 |
| Aster tanacetifolius Kunth, 1818 |
| Aster trilineatus Sch. Bip. ex Klatt, 1884 |