| Sophoreae Spreng. ex DC., 1825 |
| Sopropis Britton & Rose, 1928 |
| Sopropis palmeri (S. Watson) Britton & Rose, 1928 |
| Spartium L., 1753 |
| Spartium junceum L., 1753 |
| Sphinctospermum Rose, 1906 |
| Sphinctospermum constrictum (S. Watson) Rose, 1906 |
| Sphinga Barneby & J.W. Grimes, 1996 |
| Sphinga acatlensis (Benth.) Barneby & J.W. Grimes, 1996 |
| Sphinga platyloba (Bertero ex DC.) Barneby & J.W. Grimes, 1996 |
| Spiesia Necker ex Kuntze, 1891 |
| Spiesia acutirostris (S. Watson) M.E. Jones, 1895 |
| Stenotropis (Hassk.) Krukoff, 1974 |
| Stizolobium P. Browne, 1756 |
| Stizolobium altissimum (Jacq.) Pers., 1807 |
| Stizolobium deeringianum Bort, 1909 |
| Stizolobium holtonii Kuntze, 1891 |
| Stizolobium pruriens (L.) Medik., 1787 |
| Stizolobium pruriens var. pruriens (L.) Medik., 1787 |
| Stizolobium pruritum Piper, 1917 |