Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast; circumboreal

Habitat: Common in open, dry to somewhat moist areas from low to high elevations; tolerant of disturbance.

Flowers: February-October

Origin: Both native and introduced populations

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bumblebees, bees, flies, beetles, wasps

Aromatic perennial from a rhizome, 1-10 dm. tall.

Leaves narrow, tri-pinnate, the ultimate segments linear and short.

Heads numerous, small, in a flat-topped inflorescence; involucral bracts imbricate in several series, dry, the margins translucent; rays 3-12, 2-3 mm. long and wide, white or occasionally light pink; disk flowers 10-75, pale yellow, perfect and fertile; receptacle convex, chaffy throughout; pappus none.

Achenes compressed parallel to the involucral bracts.