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Cypripedium montanum

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Cypripedium montanum

Apparently Secure  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Cypripedioideae
Genus: Cypripedium
C. montanum
Binomial name
Cypripedium montanum
Douglas ex Lindl.
  • Cypripedium montanum f. praetertinctum Sheviak
  • Cypripedium montanum f. welchii P.M.Br.
  • Cypripedium occidentale S. Watson

Cypripedium montanum is a member of the orchid genus Cypripedium. It is commonly known as large lady's slipper, mountain lady's slipper, white lady's slipper as well as moccasin flower. This latter is also the common name of Cypripedium acaule.


Cypripedium montanum grows to be up to 70 cm (30 in) tall. The stem has alternating, plicate leaves. Atop the stem sits one to three large flowers. The sepals and petals tend to be maroon-brown while the pouch is white. This species is a close ally of Cypripedium parviflorum, so they appear to be very similar with the main difference being pouch color.


Cypripedium montanum can be found in the northwestern United States and western Canada. It is reported from California, Oregon, Washington, Idaho, Montana, Wyoming, Saskatchewan, Alberta, British Columbia and Alaska.[4][5] It is usually found at high elevation in open woods and subalpine slopes. Meriwether Lewis noted this species during his expedition while in Western Montana near Lolo Creek.[6]


  1. ^ Cypripedium montanum, Arlington, Virginia: NatureServe Explorer: An online encyclopedia of life, Version 6.1., 2006, archived from the original on 2007-09-29, retrieved 2007-06-13
  2. ^ Chen, J., Franklin, J. and Spies, T. 1995. Growing-season microclimatic gradients from clear-cut edges into old-growth Douglas-fir forests. Ecological Applications 5(1): 74-86.
  3. ^ "Cypripedium montanum Douglas ex Lindl". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 12 December 2020.
  4. ^ US Department of Agriculture plants profile
  5. ^ Biota of North America Program, county distribution map
  6. ^ Schiemann, Donald Anthony. Wildflowers of Montana, page 168. Mountain Press Publishing Company, 2005.
  • Phillip Cribb & Peter Green (1997). The Genus Cypripedium (a botanical monograph). Kew Royal Botanic Gardens, Timber Press ISBN 0-88192-403-2

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