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Mountain Lady's-slipper Back to Plant Page
Cypripedium montanum

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About Mountain Lady's-slipper (Cypripedium montanum) Cypripedium montanum is a member of the orchid genus Cypripedium. It is commonly known as the 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, sometimes called "Mountain Lady's Slipper," grows to be up to 70 cm 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. 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.
Plant Description
Plant Type
Perennial herb

Max. Height
2.3 ft (0.7 m)

Flower Color
White, Purple, Brown

Native Status
Natural Setting
Elevation ?
51' - 8227'

Annual Precip. ?
13.1" - 128.6"

Summer Precip. ?
0.26" - 3.93"

Coldest Month ?
30.3° F - 52.0° F

Hottest Month ?
49.6° F - 79.3° F

Humidity ?
0.20 vpd - 23.82 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Mountain Lady's Slipper, Cypripedium Acaule

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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