Herbs , annual, with taproot, 3-20 dm. Stems simple or branched from base, erect. Leaf blades ovate to broadly ovate, distal blades becoming ovate-lanceolate to lanceolate, 7-15 × 5-10 cm, base truncate to cordate, margins coarsely dentate, apex acute to caudate; cystoliths rounded or occasionally elongate. Inflorescences racemose, elongate. Flowers unisexual, staminate and pistillate in separate inflorescences, or with a few pistillate flowers at apex of staminate inflorescences, subsessile to short-pedunculate. Pistillate flowers: outer tepals lanceolate to narrowly ovate, 0.8-1 mm, inner tepals broadly ovate, 1.4-2.2 × 1.3-1.4 mm. Achenes ovoid, 1.4-1.6 × 1-1.1 mm. 2 n = 26.
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