Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, lawns, balds, prairies, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Europe
Conservation Status: Not of concern
Annual, the stem 0.3-3 dm. tall, reddish, the nodes swollen.
Leaves mostly basal, pinnate-pinnatifid to pinnately divided and the ultimate divisions very narrow; stipules interpetiolar, acute.
Inflorescence of umbels on long, axillary peduncles; flowers few, 10-15 mm. broad; sepals 5, distinct, bristly, with a needle-like tip; petals 5, pink, the claw with marginal hairs; filaments 10, distinct, alternating long and short, only the longer ones with anthers; styles 5, persistent, 2.5-5 cm. long, spirally twisting at maturity.
Carpels 5, sharp-pointed at the base.