| 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 |
| Sinclairia caducifolia (B.L. Rob. & Bartlett) Rydb., 1927 |
| Sinclairia cervina (B.L. Rob.) B.L. Turner, 1989 |
| Sinclairia deamii (B.L. Rob. & Bartlett) Rydb., 1927 |
| Sinclairia deppeana (Less.) Rydb., 1927 |
| Sinclairia dimidia (S.F. Blake) H. Rob. & Brettell, 1974 |
| Sinclairia discolor Hook. & Arn., 1841 |
| Sinclairia gentryi (H. Rob.) B.L. Turner, 1989 |