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Montana Field Guide

Montana Field Guides

White Prickly-poppy - Argemone polyanthemos
Other Names:  Argemone intermedia var. polyanthemos

Undetermined Origin

Global Rank: G4G5
State Rank: SNR
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Native to the Great Plains though it is unclear whether it was native to Montana or has been introduced.
General Description
Taprooted annual or biennial. Stems 40–80 cm with prickly foliage. Leaves oblanceolate, to 10 cm long, glaucous, deeply pinnately lobed with spiny-toothed margins, the upper clasping. Inflorescence bracteate cymose. Flowers 5–10 cm across; sepals 3, prickly; petals 6, white; stamens numerous with yellow filaments. Capsules ellipsoid, ca. 2 cm high, yellow-spiny (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
UT, MT, and ND south to NM and TX (Kiger 1997. Fl. N. Amer. Vol. 3).

Observations in Montana Natural Heritage Program Database
Number of Observations: 6

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Relative Density



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


  • 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.
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Citation for data on this website:
White Prickly-poppy — Argemone polyanthemos.  Montana Field Guide.  .  Retrieved on , from