E-Flora BC: Electronic Atlas of the Flora of British Columbia

Cypripedium montanum Douglas ex Lindl.
mountain lady's slipper (white lady's-slipper)
Orchidaceae (Orchid family)

Introduction to Vascular Plants

© Dave Rutherford  Email the photographer   (Photo ID #76970)

E-Flora BC Static Map
Distribution of Cypripedium montanum
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Introduction

Mountain lady's slipper is a wild orchid species found in western North America where it has been reported in the United States from Alaska, California, Idaho, Montana, Oregon, Washington and Wyoming, and in Canada from British Columbia, Alberta and Saskatchewan (USDA 2011). It is found throughout British Columbia (rare or infrequent, rare in northern BC), where it occurs in moist to dry open forests in the steppe, montane and subalpine zones from 0 to 2400 m (Flora North America 2011). It may be found in a range of conditions, from full shade to almost full sun (Luer 1975) This is a rhizomatous species with four to six pubescent leaves and one to three flowers at the end of each stem. Sepals and petals are green to brown, petals are twisted, lip is white, egg-shaped and streaked with purple. Flowering occurs from February to September over its range. Hybrids with Cypripedium parviflorum have been reported.

Read a description of this species in Flora North America.

View photos of the lady's slipper orchids of British Columbia.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Perennial herb from stout rhizomes, with coarse, fibrous roots; stems 25-70 cm tall, glandular-hairy, leafy.
Leaves:
Stem leaves 4 to 6, egg-shaped to elliptic-lanceolate, 5-16 cm long, 2.5-8 cm wide, ribbed, the base sheathing.
Flowers:
Inflorescence of 1 to 3 showy flowers; sepals brownish-purple to dark green with purple splotches, lanceolate, twisted, 3-6 cm long, 1-2 cm wide, the lower sepals united, pendant behind lip; petals similar to sepals; lip egg-shaped, 2-3 cm long, 1.5 cm wide and deep, white with purple veins.
Fruits:
Capsules, nearly erect, narrowly ellipsoid, ribbed, glandular-hairy.
Notes:
C. x columbianum Sheviak, a hybrid of C. montanum and C. parviflorum var. pubescens, is known from BC and the adjacent NW U.S.A. The type specimen for the hybrid was collected in BC (Sheviak 1992). The hybrids are either intermediate between the two species or have a mix of characteristics of each.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to dry open forests in the steppe, montane and subalpine zones; rare on N Vancouver Island, infrequent in and E of the Coast-Cascade Mountains, rare northward; N to AK, E to SK and S to WY, ID and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Cypripedium montanum

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 170 794 1709
Slope Gradient (%) 0 25 74
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 205 344
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 3 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
35
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: BWBS(4), CWH(1), ESSF(1), ICH(9), IDF(10), SBS(9)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is montane boreal & cool temperate.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

Species References

Luer, Carlyle A. 1975. The Native Orchids of the United States and Canada, Excluding Florida. W. S. Cowell Ltd, Ipswich.

General References