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Montana Field Guide

Montana Field Guides

Two-leaf Ragwort - Senecio dimorphophyllus
Other Names:  Packera dimorphophylla

Status Under Review
Native Species

Global Rank: G4
State Rank: SNR

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

General Description
Fibrous-rooted from a short rhizome or branched caudex. Stems erect, 10–30 cm. Herbage glabrous. Leaves thick, long-petiolate below; basal blades obovate to suborbicular, sometimes cordate, crenate, 1–4 cm long; cauline lanceolate to oblanceolate, pinnately lobed or toothed, the lower clasping. Inflorescence corymbiform with 1 to 12 heads. Heads radiate; involucres 5–8 mm high; phyllaries 13 or 21, glabrous, green with ciliate tips. Rays 8 or 13; ligules 3–8 mm long. Disk corollas 4–6 mm long. Achenes 2–3 mm long, glabrous (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

We have varieties dimorphophyllus and paysonii T.M. Barkley

Species Range

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

Observations in Montana Natural Heritage Program Database
Number of Observations: 22

(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:
Two-leaf Ragwort — Senecio dimorphophyllus.  Montana Field Guide.  .  Retrieved on , from