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Annual herb from a taproot; stems erect, simple, glabrous below, fine-hairy and glandular above, up to 2 m tall.
Basal leaves soon deciduous; stem leaves long-stalked, broadly egg-shaped or heart-shaped, 5-20 cm long, 2.5-20 cm wide, green above, whitish short-hairy below, at least when young, coarsely toothed or doubly-toothed.
Heads disciform, numerous in a large, terminal panicle, not subtended by the leaves; involucres 1.5-3 mm tall; the 5 outer involucral bracts larger than the 5 inner membranous bracts which partly enfold the achenes; female flowers obsolete or nearly so.
Achenes egg-shaped, sparsely fine-hairy towards the tip, minutely pimply in lines, 1.5-2 mm long; pappus lacking.
Source: The Illustrated Flora of British Columbia