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Perennial herb from a creeping rhizome; stems erect, branched above, numerous, sparsely long-hairy to thinly woolly-hairy, 0.2-1.0 m tall; flowering stems appear before the leaves.
Basal leaves arising directly from the rhizome, thick, round to heart-shaped on long stalks, shallowly to conspicuously toothed, usually with 20 or more teeth per side, white-woolly to nearly glabrous beneath, green and somewhat hairy above, the blades 20-40 cm long, 10-60 cm wide; stem leaves reduced to parallel-veined bracts, 1-8 cm long, reduced upwards, sparsely long-hairy.
Heads disciform in elongate to flat-topped clusters, stalks moderately to densely white-woolly; involucres 6-12 mm tall; involucral bracts lance-shaped with hairs at the base, green, sometimes with translucent margins; disk flowers whitish.
Achenes 5- to 10-ribbed, glabrous; pappus of white, hairlike bristles.
Source: The Illustrated Flora of British Columbia