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Montana Field Guide

Montana Field Guides

One-stem Fleabane - Erigeron simplex
Other Names:  Erigeron grandiflorus

Native Species

Global Rank: G4
State Rank: S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Widespread in a number of ranges in western and central counties. Its alpine habitat is probably secure.
General Description
Fibrous-rooted perennial with a simple or branched caudex. Stems erect, 2–15 cm. Herbage sparsely villous. Leaves basal and cauline; blades linear-oblanceolate to narrowly oblong, entire, 5–40 mm long, narrower above. Heads radiate, solitary. Involucres hemispheric, 5–12 mm high; phyllaries in 2 or 3 series, purplish, minutely glandular, tangled-villous with septate hairs. Rays 50 to 150, white to usually blue; ligules 4–10 mm long. Disk corollas 3–3.5 mm long. Achenes 2–3 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
WA and MT south to AZ and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 105

(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)


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Citation for data on this website:
One-stem Fleabane — Erigeron simplex.  Montana Field Guide.  .  Retrieved on , from