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Montana Field Guide

Montana Field Guides

Brown Starthistle - Centaurea jacea
Other Names:  Brown Knapweed, Brownray Knapweed, [Centaurea pratensis, in part]

Non-native Species

Global Rank: GNR
State Rank: SNA

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

External Links






 
General Description
Perennial. Stems erect, simple or branched, 20–80 cm. Herbage hispid to puberulent. Leaves long-petiolate below; blades oblanceolate, 4–15 cm long, sparingly dentate. Inflorescence corymbiform; heads few. Involucres hemispheric, 13–18 mm high; phyllaries ovate, brownish with scarious, white, lacerate, terminal appendages. Disk flowers 40 to 100, purple; the outer enlarged; inner corollas 15–18 mm long. Achenes 2–3 mm long; pappus absent (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced in western and northeast U.S. and Canada (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Habitat

References
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Citation for data on this website:
Brown Starthistle — Centaurea jacea.  Montana Field Guide.  .  Retrieved on , from