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Montana Field Guide

Montana Field Guides

Alpine Collomia - Collomia debilis var. camporum

Species of Concern
Native Species

Global Rank: G5T2
State Rank: S1S2
(see State Rank Reason below)
State Threat Score: Unknown
CCVI: Highly Vulnerable

Agency Status
USFS: Sensitive - Known in Forests (BD, BRT)


External Links

State Rank Reason (see State Rank above)
Only known from a few sites in western Montana and Lemhi County, Idaho, from low elevation scree, talus or rocky slopes. Negative impacts from human disturbance and weed invasion are possible. Current status of most of the documented locations is not known. Survey and monitoring data are needed.
  • Details on Status Ranking and Review
    Alpine Collomia (Collomia debilis var. camporum) Conservation Status Review
    Review Date = 11/07/2012
    View State Conservation Rank Criteria
    Population Size

    Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

    Range Extent

    Score2-3 - Local or Regional Endemic: Species has a small to very small range, though its distribution is either imprecisely documented or information to precisely categorize it was lacking at the time its status was reviewed.

    CommentEndemic to western Montana and central Idaho.

    Area of Occupancy

    Score2-3 - Very Low to Low. Occurs in 10 or fewer Subwatersheds (6th Code HUC’s), though the species' distribution is not sufficiently documented to place it within one class.

    Environmental Specificity

    Score2 - High: Species is restricted to a highly specialized and limited habitat and is typically dependent upon unaltered, high-quality habitat (C Values of 8-10).


    Score1-2 - Minor to Moderate Declines:

    CommentActual trends are unknown due to a lack of data, though low elevation populations near Missoula may have experiened some negative impacts.


    Score2 - High: 31-70% 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.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 12 to 16 total points scored out of a possible 19.

General Description
See species description.

Diagnostic Characteristics
Intergrades with variety debilis. Variety camporum generally has narrow, entire leaves with gradually tapered petioles. In contrast, variety debilis has lobed or entire leaves that are wider and generally have a more distinct petiole. Variety camporum also typically grows at lower elevations, though the varieties overlap in habitat.

Species Range
Montana Range Range Descriptions


Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(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)

Low elevation, scree, talus and rocky slopes from near the valley bottoms to the montane zone.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

Ecological Systems Associated with this Species

Threats or Limiting Factors
Reported threats to Montana’s populations of Alpine Collomia are currently assigned as unknown (MTNHP Threat Assessment 2021). Spotted Knapweed (Centaurea stoebe) is found in the vicinity of some populations, but reports indicate that weeds are unlikely to spread into scree habitat where Alpine Collomia is found. Little is known about the existing condition or presence of threats at other populations.

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Alpine Collomia — Collomia debilis var. camporum.  Montana Field Guide.  .  Retrieved on , from