This plant blooms all summer along roadsides, with large showy white
flowers which look like crumpled tissue paper from a distance.
It usually has 2 spiny sepals, 4 petals, and a cluster of many
yellow stamens. In the very center is a dark 4-lobed stigma.
The plant contains poisonous alkaloids. One source said that the seeds
contain a narcotic similar to opium. But the entire plant is armed
with spines, so it is seldom eaten by livestock.
The genus name Argemone is from a Greek word meaning "cataract",
because at one time the plant was used as a medicine to treat this