Slender Fleabane - Erigeron gracilis
* (see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
See rank details.
- Details on Status Ranking and Review
Score1 - Moderate: Generally 10,000-100,000 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
Score1 - Moderate: Generally occurring in 11-25 Subwatersheds (6th Code HUC’s).
Score0-1 - Low to Moderate.
ScoreNA - Rank factor not assessed.
Score0-1 - Low to Medium.
Score0 - Low Vulnerability: Species does not have any unusual or specific life history or biological attributes or limted reproductive potential which makes it susceptible to extirpation from stochastic events or other adverse impacts to its habitat and thus slow to recover.
Raw Conservation Status Score
4 to 6 total points scored out of a possible 16 (Rarity factors and threats only)
Fibrous-rooted perennial from slender branched caudex. Stems ascending, 5–20 cm. Herbage sparsely strigose, eglandular. Leaves basal and cauline; blades linear to linear-oblanceolate, entire, 1–8 cm long, becoming linear-lanceolate above. Heads radiate, solitary. Involucres hemispheric, 5–8 mm high; phyllaries in 2 or 3 series, strigose, eglandular. Rays 40 to 100, blue or purple; ligules 5–12 mm long. Disk corollas 3–5 mm long. Achenes ca. 2 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Endemic to southwest MT and adjacent ID and WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
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)
Meadows, grasslands, sagebrush steppe and rocky slopes primarily in the subalpine zone.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P. 1992. Vascular plant and sensitive plant species inventory for the Highland Mountains, Deerlodge National Forest. Unpublished report prepared for the Deerlodge National Forest. Montana Natural Heritage Program, Helena, MT. 21 pp. plus appendices, photographs.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Vanderhorst, J.P. and P. Lesica. 1994. Sensitive plant survey in the Tendoy Mountains, Beaverhead County, Montana. Unpublished report to the Bureau of Land Management, Butte District. Montana Natural Heritage Program, Helena, MT. 59 pp. plus appendices.