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Montana Field Guide

Montana Field Guides

Bull Thistle - Cirsium vulgare

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

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

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General Description
Taprooted biennial. Stems erect, often branched, 30–120 cm. Herbage green, spreading-hirsute to sparsely arachnoid. Leaves short-petiolate; blades lanceolate to obovate, 5–30 cm long, deeply pinnately lobed with prominent whitish veins beneath. Inflorescence heads mostly solitary at stem tips, forming open corymbiform arrays; peduncles 1–8 cm long. Involucres campanulate, 25–40 mm high, sparsely arachnoid; phyllaries imbricate in 10 to 12 series, green, linear-lanceolate; outer keeled but not resinous with an erect or spreading spine-tip 2–10 mm long; inner linear, acuminate. Disk corollas purple, 2–3 cm long. Achenes 3–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
Introduced throughout N. America; native to Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 100

(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 meadows, thickets, roadsides; plains, valleys, montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Bull Thistle — Cirsium vulgare.  Montana Field Guide.  .  Retrieved on , from