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Montana Field Guide

Montana Field Guides

Yellow Starthistle - Centaurea solstitialis
Other Names:  Yellow Star-thistle

Noxious Weed: Priority 1A

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Annual. Stems winged, erect, simple or branched above, 10–80 cm. Herbage scabrous, tomentose. Leaves short-petiolate, deciduous below; blades linear-oblanceolate, 5–15 cm long, the lower pinnately lobed. Inflorescence solitary heads in corymbiform arrays. Involucres ovoid, 13–17 mm high; phyllaries pale green; the outer ovate, the tips with a long, spreading spine and several smaller bristles; inner lanceolate with swollen tips. Disk flowers yellow; the outer and inner similar; corollas 13–20 mm long. Achenes 2–3 mm long; pappus of bristles or absent (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced throughout most of U.S. and southern Canada (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 9

(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:
Yellow Starthistle — Centaurea solstitialis.  Montana Field Guide.  .  Retrieved on , from