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Montana Field Guide

Montana Field Guides

Platte Cinquefoil - Potentilla plattensis

Species of Concern

Global Rank: G4
State Rank: S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 4
C-value: 6

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is known from several collections, particularly from Beaverhead County.
  • Details on Status Ranking and Review
    Platte Cinquefoil (Potentilla plattensis) Conservation Status Review
    Review Date = 05/28/2013
    View State Conservation Rank Criteria
    Population Size

    Score2 - Small: Generally 2,000-10,000 individuals.

    CommentEstimated. Precise population data are lacking though the species is describes as common at several of the collection sites.

    Range Extent

    Score0-1 - Widespread to Sporadically Distributed: Species has a distribution in the state such that it is borderline in its classification or its distribution is too imprecisely documented to place it in one class.

    Area of Occupancy

    Score2 - Low: Generally occurring in 4-10 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).

    Trends

    ScoreNA - Rank factor not assessed.

    Threats

    ScoreNA - Rank factor not assessed.

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    Raw Conservation Status Score

    Score 5 to 7 total points scored out of a possible 13 (Rarity factors only).

 
General Description
Platte Cinquefoil is a perennial herb with several erect to prostrate stems that are 10-20 cm high and arising from a branched rootcrown and taproot. The numerous, pinnately compound, basal leaves have 7-17 oblong, deeply-lobed leaflets and petioles that are 1-7 cm long. Stem leaves are alternate and become sessile above. Foliage is sparsely covered with long hairs. The stalked flowers are borne in an open, branched inflorescence that is nearly half as high as the plant. The saucer-shaped flowers have 5 broadly lance-shaped sepals that are 3-4 mm long, 5 yellow, oblong petals that are 4-6 mm long, 20 stamens, and numerous ovaries. The nearly smooth, brown achenes are 1-2 mm long, and each has a filiform style arising from near the top.

Phenology
Flowering in June.

Diagnostic Characteristics
There are many similar-appearing species of Potentilla. A technical key and hand lens or microscope are required for positive determination. The leaves with 7-17 sparsely hairy leaflets and the achene with a long, slender style borne at its tip help to identify this species.

Species Range
Present
 


Range Comments
AB to MB, south to AZ and NM. Sparse.

Summary of Observations Submitted for Montana
Number of Observations: 11

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

Recency

 

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



Habitat
Mesic grasslands and sagebrush steppe in the valley and montane zones.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Platte Cinquefoil — Potentilla plattensis.  Montana Field Guide.  .  Retrieved on , from