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Perennial herb from a thick fleshy rhizome; stems erect, solitary, simple or sometimes branched, finely spreading-hairy, up to 2 m tall.
Basal leaves lacking; stem leaves alternate, irregularly shallowly-toothed, velvety beneath, nearly glabrous or spreading-hairy above, lower leaves stalked and elliptic, upper leaves more or less egg-shaped, unstalked or heart-shaped and clasping at the base, 25-50 cm long, 10-20 cm wide.
Heads with ray and disk flowers with a few large flat or convex receptacles on stalks; involucres 2-2.5 cm tall; outer involucral bracts broad, densely short-hairy, inner ones narrow, more or less papery; ray flowers yellow, slender, 2.5-3 cm long; disks usually 3-5 cm wide.
Achenes 4-angled, glabrous, 4.5-5 mm long; pappus of numerous hairlike bristles, longer than the achenes.
Source: The Illustrated Flora of British Columbia