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Perennial herb from a taproot; stems rushlike with milky juice, much branched, spreading, stiff-hairy near the base, 0.4-1.0 m tall.
Basal and lower stem leaves sharply cleft or pinnately cut, with backward pointing segments, wing-stalked, 5-13 cm long, 1.5-3.5 cm wide, soon deciduous; middle and upper stem leaves alternate, reduced, linear.
Heads with strap-shaped flowers, cylindric, scattered along the branches; involucres 9-12 mm tall; involucral bracts about 8, linear-lanceolate, glabrous or sparsely woolly-hairy, in 2 series, the outer ones few and reduced; ray flowers yellow, 9-12; disk flowers lacking.
Achenes multinerved, about 3 mm long with a circle of small scales at the base of the long, slender beak; pappus of numerous, white, hairlike bristles.
Source: The Illustrated Flora of British Columbia