| Spiranthes rhombilabia (Garay) McVaugh, 1985 |
| Spiranthes richardiana Schltr., 1918 |
| Spiranthes romanzoffiana Cham., 1828 |
| Spiranthes rosulata Lindl., 1843 |
| Spiranthes rubrocallosa B.L. Rob. & Greenm., 1895 |
| Spiranthes saccata A. Rich. & Galeotti, 1845 |
| Spiranthes saltensis Ames, 1908 |
| Spiranthes sarcoglossa A. Rich. & Galeotti, 1845 |
| Spiranthes sawyeri Standl. & L.O. Williams, 1953 |
| Spiranthes sceptrodes Rchb. f., 1855 |
| Spiranthes schaffneri Rchb. f., 1857 |
| Spiranthes seminuda Schltr., 1906 |
| Spiranthes spanantha McVaugh, 1985 |
| Spiranthes sparsiflora C. Schweinf., 1937 |
| Spiranthes stenorrhynchoides (Griseb.) León, 1946 |
| Spiranthes stolonifera Ames & Correll, 1942 |
| Spiranthes stricta (Rydb.) A. Nelson, 1909 |
| Spiranthes sulphurea (Lex.) Hemsl., 1884 |
| Spiranthes tenella L.O. Williams, 1946 |
| Spiranthes tenuiflora Greenm., 1900 |