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Perennial, aromatic herb, sometimes with a woody base; stems ascending to erect, clustered, branched above, finely hairy or eventually glabrate, 40-120 cm tall.
Lower ones long-stalked and 2-3 times pinnately cut, with mostly oblong, obtuse segments mostly 1.5-4.0 mm wide, the blade rounded to egg-shaped in outline, mostly 3-8 cm long, becoming progressively less divided, shorter-stalked and reduced upwards, the divisions more abruptly sharp-pointed, glabrate to finely hairy.
Heads disciform, nodding, in a branched inflorescence; involucres hemispheric, 2-3 mm tall; involucral bracts with densely long, silky, appressed hairs, the outer ones linear, the inner broadly elliptic with broad, thin, dry, papery margins; receptacles with numerous long white hairs between the flowers; female flowers 9-20, fertile; disk flowers 30-50, fertile.
Source: The Illustrated Flora of British Columbia