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Montana Field Guides

Square-stem Monkeyflower - Mimulus ringens

Species of Concern
Native Species

Global Rank: G5
State Rank: S2?
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Rare. Currently known from a few riparian sites along the Missouri River in central Montana. Additional survey data are needed.
  • Details on Status Ranking and Review
    Square-stem Monkeyflower (Mimulus ringens) Conservation Status Review
    Review Date = 05/29/2013
    View State Conservation Rank Criteria
    Population Size

    Score3 - Vey Small: Generally <2,000 individuals.

    CommentAdditional surveys are needed.

    Range Extent

    Score2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana.

    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).

    CommentSpecific habitat requirements uncertain.


    ScoreNA - Rank factor not assessed.


    ScoreNA - Rank factor not assessed.

    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 9 total points scored out of a possible 13 (Rarity factors only).

General Description
Mat-forming, rhizomatous perennial. Stems ascending to erect, simple or branched, 4-angled, 20–100 cm. Herbage glabrous. Leaves sessile, lanceolate to oblanceolate, serrate, 2–8 cm long. Flowers: calyx 10–16 mm long, teeth acute, subequal; pedicel ca. twice as long as calyx; corolla 20–27 mm long, purple, bilabiate, palate bearded, closing the throat. Capsule 10–12 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
SK to NS south to ID, CO and TX (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 7

(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)

Riparian areas of streams and rivers on the plains.

Ecological Systems Associated with this Species

  • Literature Cited AboveLegend:   View Online Publication
    • Great Plains Flora Association (McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield - eds.). 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
    • 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:
Square-stem Monkeyflower — Mimulus ringens.  Montana Field Guide.  .  Retrieved on , from