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Large, coarse, biennial herb; stems erect, leafy, 0.5-1.5 m tall.
Basal leaves large, up to 60 cm long and 40 cm wide, egg- to heart-shaped, short-stalked or unstalked (the lower stalks hollow), green and nearly glabrous above, thinly white-woolly beneath; stem leaves similar, alternate, progressively reduced upwards.
Heads numerous in a relatively scattered, elongate inflorescence; involucres globose, burlike, 1.5-2.5, rarely 3.5 cm wide, nearly unstalked or on short stalks; involucral bracts in several series, long, narrow, angled, ascending with inwardly hooked tips; ray flowers lacking; disk flowers deep pink to purple, tubular.
Achenes glabrous, oblong, 3-angled, several-ribbed; pappus of numerous short bristles.
Source: The Illustrated Flora of British Columbia