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Montana Field Guide

Montana Field Guides

Meadow Thistle - Cirsium scariosum

Native Species

Global Rank: G5
State Rank: S4S5

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 5

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General Description
Taprooted biennial. Stems erect, mostly unbranched, 15–80 cm. Herbage sparsely arachnoid-villous to arachnoid-tomentose, often purplish. Leaves petiolate below; blades linear to linear-oblanceolate, 10–40 cm long, shallowly to deeply pinnately lobed. Inflorescence capitate with ca. 5 to 20 subsessile heads subtended by leaf-like bracts mostly longer than the flowers; peduncles 0–1 cm long. Involucres ovoid to hemispheric, 15–30 mm high; phyllaries imbricate in 5 to 10 series, green, not keeled; outer lanceolate, glabrate or arachnoid on the margins with a spine 1–8 mm long; inner linear-lanceolate with a hispid-ciliate to scarious-erose tip. Disk corollas white to purple, 20–26 mm long. Achenes 4–7 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
BC, AB south to CA, AZ and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 294

(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
Moist to wet, sometimes calcareous meadows, grasslands; valleys to subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View Online Publication
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    • Fultz, J.E. 2005. Effects of shelterwood management on flower-visiting insects and their floral resources. M.Sc. Thesis. Bozeman, MT: Montana State University. 163 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Martin, S.A. 1985. Ecology of the Rock Creek bighorn sheep herd, Beartooth Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 152 p.
    • Steerey, W. F. 1979. Distribution, range use and population characteristics of Mule Deer associated with the Schafer Creek winter range, Bridger Mountains, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 119 p.
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Citation for data on this website:
Meadow Thistle — Cirsium scariosum.  Montana Field Guide.  .  Retrieved on , from