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Montana Field Guide

Montana Field Guides

Soft Aster - Symphyotrichum molle

Species of Concern
Native Species

Global Rank: G3
State Rank: S1S3
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Known in Montana from 1 collection from the Bighorn Mtns. Though its exact status is uncertain, its rarity warrants its inclusion as a Species of Concern.
General Description
Rhizomatous perennial. Stems ascending to erect, 30–60 cm. Herbage pubescent to sericeous. Leaves basal and cauline; blades oblanceolate, 1–5 cm long, entire; the lower petiolate. Inflorescence leafy-paniculate with several heads; peduncles pubescent. Involucre campanulate, 7–9 mm high; phyllaries spreading, oblanceolate, pubescent, green above, white below; inner narrower. Rays 20 to 35, violet; ligules 12–20 mm long. Disk flowers 35 to 70, yellow; corollas 5–7 mm long. Achenes cylindric, 2–4 mm long, hairy (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Endemic to Big Horn County, MT and adjacent WY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 2

(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:
Soft Aster — Symphyotrichum molle.  Montana Field Guide.  .  Retrieved on , from