White-flower mexican-poppy

Argemone ochroleuca, the white-flower Mexican-poppy, is an erect annual or short-lived perennial of the Papaveraceae, native to Mexico and widely naturalized as a weed across the Americas, Africa, Asia, and Australia. Plants reach 30–100 cm with glaucous, prickly, much-branched stems exuding pale-yellow latex when cut. Leaves are alternate, sessile, deeply pinnately lobed, 5–20 cm long, glaucous-blue with white veins and stout spines along midrib, margins, and veins. Solitary flowers 4–7 cm across are borne at branch tips; sepals 3, prickly with horned tips; petals 6, obovate, cream to pale yellow. Stamens are numerous with yellow anthers; the ovary is ellipsoid, densely spiny, maturing into a prickly capsule 2.5–4 cm long that splits along 4–6 valves to release many tiny, pitted, dark-brown seeds. Flowering occurs much of the year in warm climates. All parts contain toxic isoquinoline alkaloids (berberine, protopine, sanguinarine).