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Perennial herb from a short rhizome or branched base; stems leafy, erect, numerous, sometimes branched above, glabrate below, sparsely hairy above, 30-60 cm tall.
Basal leaves poorly developed, often deciduous by flowering time; stem leaves opposite, unstalked to shortly stalked, usually 5-7 (sometimes 4) pairs, linear-lanceolate to lance-elliptic, entire or sometimes inconspicuously toothed, 5-15 cm long, 1.0-3.5 cm wide, short-hairy to sparsely glandular.
Heads with ray and disk flowers, 7-20 (rarely as few as 3 or as many as 35), the bases sparsely to moderate hairy and often with dense, stalked glands; involucres 7-12 mm tall; involucral bracts linear-lanceolate to oblanceolate, hairy; ray flowers yellow, 8-13, conspicuously or inconspicuously toothed; disk flowers yellow.
Achenes 4.5-5.5 mm long, subglabrate or with some short-stalked glands; pappus brownish, more or less feathery.
Source: The Illustrated Flora of British Columbia