| Specklinia repens (Ames) Pridgeon & M.W. Chase, 2001 |
| Specklinia samacensis (Ames) Pridgeon & M.W. Chase, 2001 |
| Specklinia segregatifolia (Ames & C. Schweinf.) Solano & Soto Arenas, 2003 |
| Specklinia sertularioides (Sw.) Lindl., 1830 |
| Specklinia setosa (C. Schweinf.) Pridgeon & M.W. Chase, 2001 |
| Specklinia spectabilis (Ames & C. Schweinf.) Pupulin & Karremans, 2012 |
| Specklinia tribuloides (Sw.) Pridgeon & M.W. Chase, 2001 |
| Specklinia xerophila (Schltr.) Luer, 2004 |
| Specklinia yucatanensis (Ames & C. Schweinf.) Pridgeon & M.W. Chase, 2001 |
| Spiranthes Rich., 1817 |
| Spiranthes acaulis (Sm.) Cogn., 1895 |
| Spiranthes adnata (Sw.) Benth. ex Fawc., 1893 |
| Spiranthes affinis C. Schweinf., 1937 |
| Spiranthes aguacatensis Rchb. f., 1855 |
| Spiranthes albovaginata C. Schweinf., 1937 |
| Spiranthes arseniana Kraenzl., 1915 |
| Spiranthes assurgens Rchb. f., 1866 |
| Spiranthes aurantiaca (Lex.) Hemsl., 1884 |
| Spiranthes aurantiaca var. acuminata B.L. Rob. & Seaton, 1893 |
| Spiranthes bicaudata Ames, 1922 |