Stem erect, branched above, to 2 m, uncinate- puberulent and spreading-hairy at least above, stipules linear-subulate, to 8 mm; petioles 2-20 mm, the petiole and lf-rachis together a sixth to a half as long as the terminal lfl; lfls oblong or lance-oblong, appressed-hairy beneath, the terminal one 5-9 cm; racemes densely fld, with conspicuous lance-ovate bracts; fls 10-13 mm, on pedicels 5-8 mm; cal 5-7 mm; stipe 2-4 mm; articles 3-5, 5-6.5 mm, the lower margin rounded. Moist soil, thickets, and river-banks; Que. and N.S. to Alta., s. to Md., w. Va., Mo., and Okla., common. July, Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.