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Montana Field Guide

Montana Field Guides

English Sundew - Drosera anglica

Species of Concern

Global Rank: G5
State Rank: S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank: 2
C-value: 10

External Links






State Rank Reason (see State Rank above)
Known from over two dozen populations in the state, most of these are moderate to large-sized, healthy populations. Most occurrences are on federally managed lands with several of these in designated wilderness areas, research natural areas or Glacier National Park which help to protect the occurrences from many potential threats. However, one population is vulnerable to ski area expansion and activity, and the species may be negatively impacted by fire as observations at one location appear to indicate. Plants are also sensitive to and negatively impacted by trampling of peat mats on which the species grow.
  • Details on Status Ranking and Review
    English Sundew (Drosera anglica) Conservation Status Review
    Review Date = 05/30/2013
    View State Conservation Rank Criteria
    Population Size

    Score1 - Moderate: Generally 10,000-100,000 individuals.

    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

    Score1 - Moderate: Generally occurring in 11-25 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

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

 
General Description
English Sundew is a perennial herb with a rosette of basal leaves and unbranched, leafless stems that are 6-18 cm high and which arise from a simple rootcrown. The leaves have stalks that are 2-8 cm long; leaves have narrowly oblong blades that are 1-3 cm long and 3-5 mm wide and covered on the upper surfaces with reddish, stalked glands that trap insects. 2-7 short-stalked flowers are borne on one side of the top of the stem. Each flower has a 5-lobed calyx that is 5-6 mm long and 5 separate, oblong, white petals that are longer than the calyx. There are 5 stamens and 4-5 styles, which are divided more than half their length. The fruit is a many-seeded capsule, and seeds are at least 1 mm long.

Phenology
Flowering late June-July, fruiting July-August.

Diagnostic Characteristics
The leaf blades of D. rotundifolia are about as long as they are wide. Drosera linearis has narrow leaf blades, but the seeds are less than 1 mm long. A hand lens or microscope will be required to measure the seeds.

Species Range
Present
 


Range Comments
Eurasia and AK to CA, east to ID, WY, and the Great Lakes.


Summary of Observations Submitted for Montana
Number of Observations: 91

(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
With spaghnum moss in wet, organic soils of fens in the montane zone.

Ecological Systems Associated with this Species

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