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Montana Field Guide

Montana Field Guides

Slenderleaf Sundew - Drosera linearis

Species of Concern

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

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
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).

    Trends

    ScoreNA - Rank factor not assessed.

    Threats

    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.

Phenology
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

Click the legend blocks above to view individual ranges.
 


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

Summary of Observations Submitted for Montana
Number of Observations: 16

(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
Wet, organic soil of nutrient-poor fens in the montane zone.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habit Model available.

To learn how these Models were created see http://mtnhp.org/models

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Slenderleaf Sundew — Drosera linearis.  Montana Field Guide.  .  Retrieved on , from