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Montana Field Guide

Montana Field Guides

Roundleaf Sundew - Drosera rotundifolia

Potential Species of Concern
Native Species

Global Rank: G5
State Rank: S3S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 10

External Links

State Rank Reason (see State Rank above)
Our most common sundew. Numerous occurrences in fens across western Montana.
  • Details on Status Ranking and Review
    Roundleaf Sundew (Drosera rotundifolia) Conservation Status Review
    Review Date = 05/30/2013
    View State Conservation Rank Criteria
    Population Size

    Score0-1 - Moderate to Large: Population size is imprecisely known but is believed to be >10,000 individuals.

    CommentPopulation sizes are generally undocumented. However, it is generally more abundant than Drosera anglica.

    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

    Score0-1 - Moderate to High. Occurs in >10 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).


    ScoreNA - Rank factor not assessed.


    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.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

    Raw Conservation Status Score

    Score 4 to 7 total points scored out of a possible 16 (Rarity factors and threats only).

General Description
Stems erect, 3–20 cm. Leaves spreading to prostrate; blades orbicular, 4–12 mm long; petiole 1–3 cm long. Flowers: petals ca. 6 mm long; calyx just shorter; styles usually 3. Capsule 4–5 mm high with seeds ca. 1.5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
The leaves are round or nearly so.

Species Range

Range Comments
Circumboreal south to CA, MY, ND and FL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 56

(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)

In spaghnum fens in montane zone.

Ecological Systems Associated with this Species

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Citation for data on this website:
Roundleaf Sundew — Drosera rotundifolia.  Montana Field Guide.  .  Retrieved on , from