| Stizolobium urens (L.) Pers., 1807 |
| Strombocarpa (Benth.) Engelm. & A. Gray, 1845 |
| Strombocarpa brevifolia Nutt. ex A. Gray, 1852 |
| Strombocarpa cinerascens A. Gray, 1852 |
| Strombocarpa odorata (Torr. & Frém.) A. Gray, 1854 |
| Strombocarpa palmeri (S. Watson) C.E. Hughes & G.P. Lewis, 2022 |
| Strombocarpa pubescens (Benth.) A. Gray, 1852 |
| Strombocarpa reptans (Benth.) A. Gray, 1854 |
| Strongylodon Vogel, 1836 |
| Strongylodon macrobotrys A. Gray, 1854 |
| Strophostyles Elliott, 1823 |
| Strophostyles helvola (L.) Elliott, 1823 |
| Strophostyles leiosperma (Torr. & A. Gray) Piper, 1926 |
| Strophostyles umbellata (Willd.) Britton, 1897 |
| Stylosanthes Sw., 1788 |
| Stylosanthes bangii Taub., 1895 |
| Stylosanthes calcicola Small, 1933 |
| Stylosanthes dissitiflora B.L. Rob. & Seaton, 1893 |
| Stylosanthes eciliata S.F. Blake, 1924 |
| Stylosanthes glutinosa Kunth, 1824 |