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Perennial herb from a fibrous root; stems erect, solitary, branched above, sparsely woolly-hairy when young, 0.3-2 m tall.
Basal leaves lacking; stem leaves alternate, egg-shaped to triangular or lanceolate, the bases squared off or wedge- or heart-shaped, stalked, the blades 5-15 cm long, 1-7 cm wide, strongly toothed, sparsely woolly-hairy when young, persistently so on the lower surfaces, upper leaves unstalked or with very short stalks.
Heads discoid, solitary at ends of branches in a clustered inflorescence; involucres 10-14 mm tall; involucral bracts in 3-4 series, the margins and tips dark pigmented, the outer bracts egg-shaped, shorter than the inner, long-hairy; disk flowers pale purple or rarely white, 8-21 (typically 13); receptacles papery.
Achenes oblong, nerved, 4-6 mm, glabrous; pappus of brownish, feathery bristles.
Source: The Illustrated Flora of British Columbia