| Epidendrum whartonianum C. Schweinf., 1948 |
| Epidendrum xipheres Rchb. f., 1854 |
| Epipactis Zinn, 1757 |
| Epipactis americana Lindl., 1840 |
| Epipactis dolabripetala Ames, 1908 |
| Epipactis gigantea Douglas ex Hook., 1839 |
| Epipactis pringlei Gand., 1920 |
| Epipactis striata (Rchb. f.) A.A. Eaton, 1908 |
| Eriopsidinae Szlach., 1995 |
| Eriopsis Lindl., 1847 |
| Eriopsis wercklei Schltr., 1920 |
| Erycina Lindl., 1853 |
| Erycina crista-galli (Rchb. f.) N.H. Williams & M.W. Chase, 2001 |
| Erycina diaphana (Rchb. f.) Schltr., 1918 |
| Erycina echinata (Kunth) Lindl., 1853 |
| Erycina hyalinobulbon (Lex.) N.H. Williams & M.W. Chase, 2001 |
| Erycina major Schltr., 1918 |
| Erycina pumilio (Rchb. f.) N.H. Williams & M.W. Chase, 2001 |
| Erycina pusilla (L.) N.H. Williams & M.W. Chase, 2001 |
| Erythrodes Blume, 1825 |