Herbs perennial, monoecious, 40-100 cm tall. Stems ascending or erect, simple, glabrescent or pilose. Leaves alternate; nanophylls absent; stipules narrowly linear, 4-8 × 0.2-0.3 mm, glabrous, with cystoliths; petiole 0-2.5 mm; leaf blade green after drying, obliquely oblong, 10-27 × 3.5-7.5 cm, thinly herbaceous, major basal lateral veins absent and venation pinnate, abaxial surface sparsely puberulent or glabrescent along veins, adaxial surface sparsely strigillose, cystoliths conspicuous, dense; base with broader half rounded, margin densely dentate, apex cuspidate. Male inflorescences solitary, simple, 11-22 × 10-15 mm; peduncle 3-4 mm; receptacle nearly elliptic, 10-16 × 9-12 mm; bracts connate, 5-7 mm; bracteoles linear. Female inflorescences solitary or rarely in pairs, 2-5 mm in diam., sessile; receptacle nearly quadrate, ca. 4 × 4 mm; bracts triangular; bracteoles spatulate-linear. Male flowers 5-merous. Fl. Mar-Sep.
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