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Montana Field Guide

Montana Field Guides

Prairie Ragwort - Senecio plattensis
Other Names:  Packera plattensis

Status Under Review
Native Species

Global Rank: G5
State Rank: S3S4

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Fibrous-rooted from a rhizome or short caudex. Stems erect, 10–40 cm. Herbage arachnoid-tomentose, sometimes sparsely so on leaves. Leaves: basal long-petiolate; blades ovate to lanceolate, crenate to lobed, 2–5 cm long; cauline becoming sessile, narrower, pinnately lobed. Inflorescence corymbiform with 4 to 20 heads. Heads radiate; involucres 5–9 mm high; phyllaries 13 or 21, tomentose. Rays 8 to 10; ligules 5–10 mm long. Disk corollas 5–7 mm long. Achenes 1–3 mm long, puberulent on the ribs(Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range


Range Comments
SK to QC south to NM, KS, LA and AL (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 48

(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:
Prairie Ragwort — Senecio plattensis.  Montana Field Guide.  .  Retrieved on , from