| Sinclairia sublobata (B.L. Rob.) Rydb., 1927 |
| Sinclairia tajumulcensis (Standl. & Steyerm.) H. Rob. & Brettell, 1974 |
| Sinclairia tonduzii (B.L. Rob.) Rydb., 1927 |
| Sinclairia vagans (S.F. Blake) H. Rob. & Brettell, 1974 |
| Sinclairiinae H. Rob., 2009 |
| Sinclairiopsis Rydb., 1927 |
| Sinclairiopsis ismaelis (Panero & Villaseñor) V.A. Funk, 2012 |
| Sinclairiopsis klattii (B.L. Rob. & Greenm.) Rydb., 1927 |
| Smallanthus Markgr., 1933 |
| Smallanthus apus (S.F. Blake) H. Rob., 1978 |
| Smallanthus maculatus (Cav.) H. Rob., 1978 |
| Smallanthus maculatus var. maculatus (Cav.) H. Rob., 1978 |
| Smallanthus macvaughii (J.R. Wells) H. Rob., 1978 |
| Smallanthus oaxacanus (Sch. Bip. ex Klatt) H. Rob., 1978 |
| Smallanthus obscurus B.L. Turner, 1988 |
| Smallanthus putlanus B.L. Turner, 2010 |
| Smallanthus riparius (Kunth) H. Rob., 1978 |
| Smallanthus uvedalia (L.) Mack., 1933 |
| Sobreyra Ruiz & Pav., 1794 |
| Sobreyra sessilifolia Ruiz & Pav., 1798 |