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Montana Field Guide

Montana Field Guides

Black Starthistle - Centaurea nigra

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 0

External Links

General Description
Perennial. Stems erect, branched, 25–80 cm. Herbage puberulent to sparsely tomemtose. Leaves petiolate below; blades oblanceolate, 3–8 cm long, sparingly dentate. Inflorescence corymbiform; heads few. Involucres broadly campanulate, 13–18 mm high; phyllaries with black tips; the outer ovate with wiry-pectinate terminal appendages; inner oblanceolate with scarious, crenate margins. Disk flowers 40 to 100, purple; the outer rarely enlarged; inner corollas 15–18 mm long. Achenes 2–3 mm long; pappus of short, black bristles (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

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

Summary of Observations Submitted for Montana
Number of Observations: 0

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(Observations spanning multiple months or years are excluded from time charts)


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Citation for data on this website:
Black Starthistle — Centaurea nigra.  Montana Field Guide.  .  Retrieved on , from