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Plants 4–9 dm from a stout branched caudex, glabrous except for the scabro-ciliate lf-margins; lvs basally disposed, flat, not triple-nerved, the larger ones with lance-elliptic or narrowly elliptic, slightly toothed to entire blade 8–22 cm × 8–50 mm, often exceeded by the long petiole; cauline lvs few or rather numerous, the middle ones sessile or short-petiolate, 6–12 times as long as wide; infl corymbiform, the heads numerous, rarely less than 50, often several hundred; invol glabrous, 4–5 mm, its bracts firm, obtuse or broadly rounded, ± striate; rays 6–8, short; disk-fls ca 20; achenes glabrous, 3–5-angled, the angles scarcely or obscurely nerved; 2n=18. Swamps, beaches, and other moist places; c. N.Y. and s. Ont. to Ill., Mich., and Wis.
