| Scientific Name | Authority | Status |
|---|---|---|
| Serapias gigantea | (Douglas) A.A.Eaton | synonym |
| Peramium giganteum | (Douglas) J.M.Coult. | synonym |
| Arthrochilium giganteum | (Douglas) Szlach. | synonym |
| Cephalanthera kokanica | Regel ex Nevski | synonym |
| Amesia gigantea | (Douglas) A.Nelson & J.F.Macbr. | synonym |
| Limodorum giganteum | (Douglas) Kuntze | ambiguous synonym |
| Epipactis pringlei | Gand. | synonym |
| Epipactis americana | Lindl. | synonym |
| Epipactis gigantea f. rubrifolia | P.M.Br. | synonym |
| Helleborine gigantea | (Douglas) Druce | synonym |
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