Echioglossum, Genus – synonym of Cleisostoma, Genus
Elasmatium, Genus – synonym of Goodyera, Genus
Elassoglossum, Section – synonym of Polymeres, Section (Bulbophyllum)
Elatae, Section – synonym of Brachyantha, Section (Bulbophyllum)
Elegantes, Section – synonym of Sestochilos, Section (Bulbophyllum)
Empusa, Genus – synonym of Liparis, Genus
Ephippium, Genus – synonym of Bulbophyllum, Genus
Ephippium, Genus – synonym of Cirrhopetalum, Section (Bulbophyllum)
Ephippium, Section – synonym of Cirrhopetalum, Section (Bulbophyllum)
Epibulbon, Section – synonym of Polymeres, Section (Bulbophyllum)
Epicranthes, Genus – synonym of Bulbophyllum, Genus
Epicrianthes, Section (Bulbophyllum)
Epicrianthes, Subgenus – synonym of Epicrianthes, Section (Bulbophyllum)
Epipactis, Genus – synonym of Goodyera, Genus
Epiphanes, Genus – synonym of Gastrodia, Genus
Eremorchis, Genus – synonym of Pterostylis, Genus
Erioxantha, Genus – synonym of Eria, Genus
Etaeria, Genus – synonym of Hetaeria, Genus
Eu-Bulbophyllum, Subgenus – synonym of Polymeres, Section (Bulbophyllum)
Euanthe, Genus – synonym of Vanda, Genus
Eucosia, Genus – synonym of Goodyera, Genus
Eulophus, Genus – synonym of Eulophia, Genus
Euproboscis, Genus – synonym of Thelasis, Genus
Exeria, Genus – synonym of Eria, Genus