Stem erect, 1–2 m, pubescent with hooked hairs, commonly with a single long terminal raceme or few-branched panicle; stipules ovate, acuminate, 10–15 mm; petioles much longer than the stalk of the terminal lfl; lfls lance-ovate, rough on both sides with hooked hairs, strongly reticulate beneath, the terminal one 6–10 cm; axis of the infl softly spreading-hairy as well as commonly with some hooked hairs; fls 8–10 mm, white, on pedicels 12–23 mm; stipe 2.5–5 mm; articles 2–5, 4.5–7 mm, with rounded margins. Rich prairie soil; s. Ont. to Wis. and Neb., s. to O., Okla., and n. Tex. July, Aug.
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