| Sanchezia nobilis var. glaucophylla Lem., 1869 |
| Sanchezia parvibracteata Sprague & Hutch., 1908 |
| Sarotheca Nees, 1847 |
| Sarotheca salviiflora (Kunth) Nees, 1847 |
| Schaueria Nees, 1838 |
| Schaueria calycobractea Hilsenb. & Marshall, 1983 |
| Schaueria parviflora (Leonard) T.F. Daniel, 1990 |
| Sclerocalyx Nees, 1846 |
| Sclerocalyx mexicanus Nees, 1846 |
| Sericographis Nees, 1847 |
| Sericographis aschenborniana Nees, 1847 |
| Sericographis moctli Nees, 1847 |
| Sericographis mohintli Nees, 1847 |
| Siphoneranthemum (Oerst.) Kuntze, 1891 |
| Siphoneranthemum fasciculatum (Oerst.) Kuntze, 1891 |
| Siphoneranthemum praecox (Benth.) Kuntze, 1891 |
| Siphonoglossa Oerst., 1855 |
| Siphonoglossa canbyi (Greenm.) Hilsenb., 1979 |
| Siphonoglossa durangensis Henrickson & Hilsenb., 1979 |
| Siphonoglossa glabrescens Lindau, 1894 |