| Spermacoce strigosa Sims, 1813 |
| Spermacoce suaveolens (G. Mey.) Kuntze, 1898 |
| Spermacoce subulata (DC.) Hemsl., 1881 |
| Spermacoce tenella Kunth, 1819 |
| Spermacoce tenuiflora Sessé & Moc., 1893 |
| Spermacoce tenuior L., 1753 |
| Spermacoce tetracocca M. Martens & Galeotti, 1844 |
| Spermacoce tetraquetra A. Rich., 1850 |
| Spermacoce vaginata Willd. ex Roem. & Schult., 1818 |
| Spermacoce vegeta (Standl. & Steyerm.) C.D. Adams, 1993 |
| Spermacoce verticillata L., 1753 |
| Spermacoce villosa Sw., 1788 |
| Spermacoceae Bercht. J. Presl, 1820 |
| Staelia Cham. & Schltdl., 1828 |
| Staelia scabra (C. Presl) Standl., 1931 |
| Stenaria (Raf.) Terrell, 2001 |
| Stenaria mullerae (Fosberg) Terrell, 2001 |
| Stenaria nigricans (Lam.) Terrell, 2001 |
| Stenaria nigricans var. gypsophila (B.L. Turner) Terrell, 2001 |
| Stenaria nigricans var. nigricans (Lam.) Terrell, 2001 |