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Montana Field Guide

Montana Field Guides

Yellow Starthistle - Centaurea solstitialis

Noxious Weed: Priority 1A
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
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).

Habitat

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