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Montana Field Guide

Montana Field Guides

Slenderleaf Sundew - Drosera linearis

Species of Concern
Native Species

Global Rank: G4G5
State Rank: S2
(see State Rank Reason below)

Agency Status
MNPS Threat Rank: 3
C-value: 10

External Links

State Rank Reason (see State Rank above)
Only known from four populations in Montana though all are moderate to large-sized occurrences that are located in either the Bob Marshall Wilderness or Indian Meadows Research Natural Area which afford all known populations some protection from disturbance.
  • Details on Status Ranking and Review
    Slenderleaf Sundew (Drosera linearis) Conservation Status Review
    Review Date = 05/30/2013
    View State Conservation Rank Criteria
    Population Size

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

    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

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

    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.


    Score0 - Low: Impacts, if any, to the species are expected to be minor or insignificant (affecting <10% of populations) in severity, scope and immediacy.

    Intrinsic Vulnerability

    Score1-2 - Moderate to High Vulnerability.

    Raw Conservation Status Score

    Score 10 to 11 total points scored out of a possible 16 (Rarity factors and threats only).

General Description
Linear-leaved sundew is a small, perennial herb with leafless, glabrous stems that are 6-13 cm tall. The linear leaf blades are 2-5 cm long and approximately 2 mm wide. Petioles are flat and 3-7 cm long, while blades are covered with long, purple, gland-tipped hairs which trap insects. The 1-4 flowers are borne in a narrow, open inflorescence at the tip of the stem. The 5 egg-shaped, white petals are approximately 6 mm long, and the sepals are 4-5 mm long. The fruit is a small capsule with numerous seeds.

Flowering late June-August, fruiting in late September.

Diagnostic Characteristics
This species is very difficult to distinguish from the more common D. anglica. The leaves of D. linearis are more linear and the seeds are rounded on the ends rather than tapered to a point.

Species Range
Montana Range


Range Comments
Boreal Canada south to ME, WI, and MT. Peripheral.

Observations in Montana Natural Heritage Program Database
Number of Observations: 18

(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)

Wet, organic soil of nutrient-poor fens in 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

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., K. Lackschewitz, J. Pierce, S. Gregory and M. O'Brien. 1986. Noteworthy collections: Montana. Madrono 33:310-312.
    • 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:
Slenderleaf Sundew — Drosera linearis.  Montana Field Guide.  .  Retrieved on , from