Perennial with crown-buds, short rhizomes, and thickened, often fleshy roots; stems 1–3 m, coarsely spreading-hairy to occasionally subglabrous; lvs flat, strongly scabrous above, usually hirsute beneath, ± triplinerved at the base, strongly toothed to subentire, lanceolate, acuminate, 8–20 × 1–3.5 cm, tapering to the short petiole or petiolar base, the upper generally alternate; heads several or many in an open infl; disk yellow, 1.5–2.5 cm wide; invol bracts narrow, thin, green (or dark below), acuminate or attenuate, loose, often conspicuously surpassing the disk, strongly hirsute-ciliate and often hairy on the back; rays 10–20, 1.5–3 cm; 2n=34. Swamps and other moist places; Me. and N.B. to n. S.C. and n. Ga., w. to s. Alta. and Neb. Aug.–Oct. (H. subtuberosus; H. rydbergii, a nw. phase approaching the cordilleran H. nuttallii Torr. & A. Gray)
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A tall herb. It keeps growing from year to year. It grows 4.5 m high and spreads 0.9 m wide. The roots are fleshy and shaped like spindles. The leaves are opposite and simple. They do not have a leaf stalk. They are narrow and rough on both sides. The leaves are 20 cm long. They have shallow teeth and are finely hairy. The leaves are oval and pointed or sword shaped. The flower is a yellow disk. The flower heads are 8 cm wide. The disk is yellow-brown and the ray florets are yellow. The flower heads occur on long stalks. The fruit is a smooth dry achene.
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