| Simsia ovata (A. Gray) E.E. Schill. & Panero, 2010 |
| Simsia rhombifolia (B.L. Rob. & Greenm.) E.E. Schill. & Panero, 2010 |
| Simsia sanguinea A. Gray, 1852 |
| Simsia sanguinea var. sanguinea A. Gray, 1852 |
| Simsia setosa S.F. Blake, 1913 |
| Simsia spooneri Panero & E.E. Schill., 1992 |
| Simsia submollicoma S.F. Blake, 1913 |
| Simsia subsetosa H. Rob. & Brettell, 1972 |
| Simsia sylvicola Panero & E.E. Schill., 1992 |
| Simsia tenuis (Fernald) S.F. Blake, 1913 |
| Simsia triloba S.F. Blake, 1913 |
| Simsia villasenorii D.M. Spooner, 1990 |
| Sinclairia Hook. & Arn., 1841 |
| Sinclairia adenotricha (Greenm.) Rydb., 1927 |
| Sinclairia andrieuxii (DC.) H. Rob. & Brettell, 1974 |
| Sinclairia andromachioides (Less.) Sch. Bip. ex Rydb., 1927 |
| Sinclairia angustissima (A. Gray) B.L. Turner, 1989 |
| Sinclairia blakei H. Rob. & Brettell, 1974 |
| Sinclairia brachypus Rydb., 1927 |
| Sinclairia broomeae H. Rob., 1976 |