Distribution: Introduced chiefly west of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Weed of cultivated areas and abondoned gardens.
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Somewhat fleshy annual, the upright stem 2-5 dm. tall, simple or occasionally branched below, umbellately branched near the top, nearly glabrous below but with dense, soft hairs above.
Lower cauline leaves alternate, oblanceolate, narrowed to the base, 1-3 cm. long, finely serrate-dentate; floral leaves opposite or whorled, finely toothed.
Flowers naked in obconic involucres, these bearing 4 greenish-yellow glands alternate with horn-less lobes; staminate flowers numerous, included in the involucre, represented by a single stamen; pistillate flower single, protruded from the involucre.
Capsule 3-celled, smooth.