Subfamily:
  Epidendroideae
Tribe:
  Neottieae
Genus: Epipactis:
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  • British Columbia, Western Canada, Northern America
  • Colorado, Northern America
  • Idaho, Northern America
  • Montana, Northern America
  • Oregon, Northern America
  • Washington, Northern America
  • Wyoming, Northern America
  • Oklahoma, Northern America
  • South Dakota, Northern America
  • Arizona, Northern America
  • California, Northern America
  • Nevada, Northern America
  • Utah, Northern America
  • New Mexico, Northern America
  • Texas, Northern America
  • Mexico Northeast, Northern America
  • Mexico Northwest, Northern America
  • Amesia gigantea (Douglas ex Hook.) A.Nelson & J.F.Macbr. (1913)
  • Arthrochilium giganteum (Douglas ex Hook.) Szlach. (2003)
  • Cephalanthera kokanica Regel ex Nevski (1935)
  • Epipactis americana Lindl. (1840)
  • Epipactis gigantea f. rubrifolia P.M.Br. (1995)
  • Epipactis pringlei Gand. (1920)
  • Helleborine gigantea (Douglas ex Hook.) Druce (1909)
  • Limodorum giganteum illeg (Douglas ex Hook.) Kuntze (1891)
  • Peramium giganteum (Douglas ex Hook.) J.M.Coult. (1894)
  • Serapias gigantea (Douglas ex Hook.) A.A.Eaton (1908)