Erect, branching, pubescent annual to 2.5 m; lvs ovate, broadly rounded at base; ocreae villous, ciliate, often with a spreading, herbaceous collar; infl large; peduncles densely hairy; racemes commonly drooping, dense, cylindric, 3-8 cm, fls rose to crimson; achenes flat, lenticular, 2.8-3.5 mm, about as wide, beakless, smooth and shining; 2n=22, 24. Native of India, often escaped in waste places near gardens. (Persicaria o.)
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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