Slenderleaf Sundew - Drosera linearis
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
Score2 - Small: Generally 2,000-10,000 individuals.
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).
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.
Score1-2 - Moderate to High Vulnerability.
Raw Conservation Status Score
10 to 11 total points scored out of a possible 16 (Rarity factors and threats only).
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.
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.
Boreal Canada south to ME, WI, and MT. Peripheral.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Wet, organic soil of nutrient-poor fens in the montane zone.
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.