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Montana Field Guides

Mountain Lady's-slipper - Cypripedium montanum

Native Species

Global Rank: G4G5
State Rank: S4
(see State Rank Reason below)
C-value: 8

Agency Status


External Links

State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Mountain Lady's-slipper (Cypripedium montanum) Conservation Status Review
    Review Date = 05/25/2012
    View State Conservation Rank Criteria
    Population Size

    Score1 - Moderate: Generally 10,000-100,000 individuals.

    Range Extent

    Score0 - Widespread species within Montana (occurs in 5% or more of the state or generally occurring in 6 or more sub-basins.) as well as outside of Montana.

    Area of Occupancy

    Score0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).


    Score0-1 - Stable to Minor Declines:



    Score1 - Medium: 11-30% of the populations are being negatively impacted or are likely to be impacted by one or more activities or agents, which are expected to result in decreased populations and/or habitat quality and/or quantity.

    CommentLow levels of threats; Timber harvesting has the potential to negatively impact some occurrences and habitat.

    Intrinsic Vulnerability

    Score2 - High Vulnerability: Very specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species highly susceptible to extirpation from stochastic events or other adverse impacts to its habitat and very slow to recover.

    CommentSpecies is intrinsicly vulnerable as a result of unusual life history or biological attributes, which makes it vulnerable to localized extirpation.

    Raw Conservation Status Score

    Score 5 to 6 total points scored out of a possible 19.

General Description
Stems 20–50 cm. Leaves alternate, lanceolate to elliptic, 5–15 cm long. Inflorescence of 1 to 3 (mostly 2) flowers; bracts 3–12 cm long. Flowers: sepals lanceolate, 3–5 cm long brownish-purple; upper petals linear, 4–6 cm long, twisted; lip petal white, 2–3 cm long. Capsule 2–3 cm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions


Range Comments
AK to CA, OR, ID and WY (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 80

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Moist to dry forest, usually in deep, moist soil but sometimes shallow, stony calcareous soil; montane (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Mountain Lady's-slipper — Cypripedium montanum.  Montana Field Guide.  .  Retrieved on , from