| Strongylosperma australe (Siebert ex Spreng.) Less., 1832 |
| Strotheria B.L. Turner, 1972 |
| Strotheria gypsophila B.L. Turner, 1972 |
| Struchium P. Browne, 1756 |
| Struchium africanum P. Beauv., 1804 |
| Struchium americanum Poir., 1806 |
| Struchium herbaceum P. Browne ex J. St. -Hil., 1805 |
| Struchium sparganophorum (L.) Kuntze, 1891 |
| Stuessya B.L. Turner & F.G. Davies, 1980 |
| Stuessya apiculata (S.F. Blake) B.L. Turner & F.G. Davies, 1980 |
| Stuessya michoacana B.L. Turner & F.G. Davies, 1980 |
| Stuessya perennans B.L. Turner & F.G. Davies, 1980 |
| Stylimnus Raf., 1819 |
| Stylocline Nutt., 1840 |
| Stylocline gnaphaloides Nutt., 1841 |
| Stylocline heringeri H. Rob., 1984 |
| Stylocline micropoides A. Gray, 1853 |
| Stylocline sonorensis Wiggins, 1950 |
| Symphyotrichinae Nesom, 1994 |
| Symphyotrichum Nees, 1832 |