| Stenotis australis (I.M. Johnst.) Terrell, 2001 |
| Stenotis brevipes (Rose) Terrell, 2001 |
| Stenotis gracilenta (I.M. Johnst.) Terrell, 2001 |
| Stenotis greenei (A. Gray) Terrell & H. Rob., 2010 |
| Stenotis mucronata (Benth.) Terrell, 2001 |
| Stenotis peninsularis (Brand) Terrell, 2001 |
| Steyermarkia Standl., 1940 |
| Steyermarkia guatemalensis Standl., 1940 |
| Strumpfia Jacq., 1760 |
| Strumpfia maritima Jacq., 1760 |
| Strumpfieae Delprete & T.J. Motley, 2014 |
| Stylosiphonia Brandegee, 1914 |
| Stylosiphonia glabra Brandegee, 1914 |
| Stylosiphonia salvadorensis Standl., 1924 |
| Syringantha Standl., 1930 |
| Syringantha coulteri (Hook. f.) T. McDowell, 1996 |
| Syringantha loranthoides Standl., 1930 |
| Tapogomea Aubl., 1775 |
| Tapogomea axillaris (Sw.) Poir., 1806 |
| Tapogomea elata (Sw.) Poir., 1806 |