| Staehelininae Garcia-Jacas & Susanna, 2019 |
| Stammarium Willd. ex DC., 1836 |
| Starkea Willd., 1803 |
| Staurochlamys Baker, 1889 |
| Staurochlamys burchellii Baker, 1889 |
| Stebbinsoseris K.L. Chambers, 1991 |
| Stebbinsoseris heterocarpa (Nutt.) K.L. Chambers, 1991 |
| Stemmodontia Cass., 1817 |
| Stenactis Cass., 1825 |
| Stenactis delphiniifolia Cass., 1825 |
| Stenactis speciosa Lindl., 1833 |
| Stenocarpha S.F. Blake, 1915 |
| Stenocarpha filiformis (Hemsl.) S.F. Blake, 1917 |
| Stenocarpha ritovegana B.L. Turner, 1992 |
| Stenocephalum Sch. Bip., 1863 |
| Stenocephalum jucundum (Gleason) H. Rob., 1987 |
| Stenotus Nutt., 1841 |
| Stenotus pulvinatus (Moran) G.L. Nesom, 1989 |
| Stephanodoria Greene, 1895 |
| Stephanodoria tomentella (B.L. Rob.) Greene, 1895 |