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Montana Field Guide

Montana Field Guides

Large-headed Ragwort - Senecio megacephalus


Global Rank: G4
State Rank: S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value:

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General Description
Fibrous-rooted from a short or branched caudex. Stems erect, 20–60 cm. Herbage arachnoid. Leaves basal and cauline; blades linear-lanceolate to oblanceolate, entire, 3–15 cm long, greatly reduced above. Inflorescence a solitary (2 to 4) head. Heads radiate; involucres 10–25 mm high; phyllaries ca. 21, arachnoid. Rays ca. 13; ligules 12–22 mm long. Disk flowers 9–14 mm long. Achenes 2–6 mm long, glabrous (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Endemic to northwest MT, adjacent ID and Canada (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 9

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Stony soil of meadows, grasslands, open forest, fellfields; upper montane to alpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Large-headed Ragwort — Senecio megacephalus.  Montana Field Guide.  .  Retrieved on , from