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Montana Field Guide

Montana Field Guides

Tansy Ragwort - Senecio jacobaea
Other Names:  Stinking Willie, Jacobaea vulgaris

Noxious Weed: Priority 2A
Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

External Links






 
General Description
Short-lived, taprooted perennial. Stems erect, 20–80 cm. Herbage sparsely arachnoid. Leaves mainly cauline at flowering; blades narrowly oblanceolate, deeply divided into dentate lobes, 4–20 cm long, becoming sessile above. Inflorescence corymbiform with 10 to 60 heads. Heads radiate; involucres 4–6 mm high; phyllaries ca. 13, glabrous. Rays ca. 13; ligules 6–10 mm long. Disk corollas 4–5 mm long. Achenes 1–2 mm long, puberulent (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced to northeast and northwest North America; native to Europe (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 759

(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
Disturbed soil of open forest, meadows, often associated with timber harvest or fire; valleys (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Management

References
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Citation for data on this website:
Tansy Ragwort — Senecio jacobaea.  Montana Field Guide.  .  Retrieved on , from