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Montana Field Guide

Montana Field Guides

Blackspot Hornpoppy - Glaucium corniculatum
Other Names:  Red Horned-poppy

Non-native Species

Global Rank: GNR
State Rank: SNA
C-value: 1

Agency Status


External Links

General Description
Annual or biennial with white-hairy foliage and yellow sap. Stems branched, to 50 cm. Leaves oblanceolate, deeply pinnately lobed, to 15 cm long; the upper ovate and clasping. Flowers solitary, long-stalked in upper leaf axils; sepals 2, 15–30 mm long; petals 4, orange to red with a black base, 20–35 mm long; stamens many. Capsules ascending, linear, slightly curved, 12–20 cm long, pubescent (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Collected once in Stillwater County in agricultural field (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

(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)

Weedy areas such as agricultural fields.


  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Blackspot Hornpoppy"
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Citation for data on this website:
Blackspot Hornpoppy — Glaucium corniculatum.  Montana Field Guide.  .  Retrieved on , from