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Montana Field Guide

Montana Field Guides

Thinsepal monkeyflower - Mimulus hymenophyllus

Species of Concern
Native Species

Global Rank: G2
State Rank: S1S2
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
See rank details. Surveys of the previous collection sites are needed to document the species' status. Without additional data, a rank of "SH" will be applicable.
  • Details on Status Ranking and Review
    Thinsepal monkeyflower (Mimulus hymenophyllus) Conservation Status Review
    Review Date = 11/07/2012
    View State Conservation Rank Criteria
    Population Size

    Score3 - Vey Small: Generally <2,000 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.

    Area of Occupancy

    Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1-2 - Moderate to High.


    Score0-3 - Population trends are unknown.


    Score0-3 - Threats levels are Unknown.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

General Description
Stems ascending, usually simple or branched at the base, 2–10 cm. Herbage sparsely glandular-pubescent. Leaves long-petiolate; the blade ovate, obscurely dentate, 5–12 mm long. Flowers: calyx 3–5 mm long, teeth equal, ca. 1 mm long; pedicel 3 to 4 times as long as calyx; corolla yellow, 7–20 mm long, nearly regular. Capsule 3–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Northeast OR, central ID, and western MT.

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(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)


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Citation for data on this website:
Thinsepal monkeyflower — Mimulus hymenophyllus.  Montana Field Guide.  .  Retrieved on , from