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Plant Form: Erect annual herb.
Size: Up to 1.5 m tall.
Stem: Bluish green, up to 1 m long and smooth or slightly covered in hairs, with yellow prickles.
Leaves: Undivided, irregularly toothed to lobed, spiny, up to 12 cm long.
Flowers: White to yellowish, up to 7 cm diameter.
Fruit and Seeds: Capsules up to 40 mm long, with many large, dark seeds.
Habitat: Roadsides, degraded land.
Distinguishing Features: Lighter coloured flowers and more spines on capsules than American poppy (Argemone mexicana).