Argemone squarrosa subsp. squarrosa
Stems with 80-200 prickles per cm⊃2;. Leaf blades: surfaces prickly on veins and prickly-hispid, often densely so, between veins. Capsules densely short-prickly as well as long-prickly, longest prickles 10-15 mm. 2n = ca. 112.
Phenology: Flowering spring–summer; fruiting summer–fall.
Habitat: Prairies and foothills
Elevation: 1000-1800 m
Colo., Kans., N.Mex., Okla.