Prickly lettuce, compass plant, wild lettuce, wild opium.
An annual or perennial that grows to 2 feet in height. Flowers are yellow, but purple or bluish when dried. Stem has a few prickles. Leaves are cleft, with lobes arranged on either side of a common axis.
June to October.
Cultivated fields, waste or disturbed areas, dry soil, and gardens.
Leaves in summer or fall; milky juice of the stem in summer.
The milky juice of this plant is extremely irritating to the eyes. The whole herb has been used as a diuretic, antispasmodic, and emollient.