Slender annual 1-2 m, reclining on other plants, or erect when young, the stems 4-angled, reflexed-prickly as are usually also the petioles and peduncles and the midrib beneath, lvs sometimes pubescent on margins, lanceolate to elliptic, 2-10 cm, to 2.5 cm wide, sagittate at base, the lobes directed downwards; infl of short, head-like, long-peduncled terminal and axillary racemes seldom over 1 cm; perianth pink to white or green; style 1.5 mm, trifid to the middle; achene trigonous, 2.2-3 mm; 2n=40. Marshes and wet meadows; Nf. and Que. to Sask., s. to Ga. and Tex. (Tracaulon s.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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