Erect, bright green annual to 1.5 m; lvs long-petioled, broadly ovate to deltoid, 5–20 cm, acute or acuminate, truncate to rounded or cordate at base, bearing on each side 1–4 large, salient teeth separated by broadly rounded sinuses; infl a loose, sparsely fld, terminal panicle of short, interrupted spikes, the branches often white-mealy; cal sparsely or not at all mealy; seeds horizontal, loosely or tightly enclosed in the readily separable pericarp, shiny-black, obscurely striolate, 1.5–2.5 mm wide, with a bluntly keeled margin; 2n=36. Disturbed ground and moist woods; Que. to Yukon, s. to Va., Ky., Ark., Tex., and Calif. (C. gigantospermum) Closely allied to the European diploid C. hybridum.
Woods, thickets, hardwood slopes, wooded tallus, nutrient-rich woods, sometimes in waste places and fields from sea level to 1800 metres.
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