Herbs, erect. Stems sometimes branched, 12-50 cm, 5-10 mm in diam., somewhat woody in appearance. Leaves cauline; stipules caducous, 0.8-1.4 cm × 4-5 mm; petiole 2.5-6 cm, glabrous; blade very shallowly peltate (petiole 1-2 mm from margin at base), oblong-lanceolate or ovate-lanceolate, slightly asymmetric, 4.5-14 × 1.5-4 cm, glabrous, venation palmate-pinnate, 5-or 6-veined, base rounded, margin remotely and minutely serrulate, apex long acuminate or long caudate. Inflorescences 2-4 cm; glabrous; bracts oblong, 2-7 × 0.6-4 mm, glabrous. Staminate flowers: pedicel 0.6-2.6 cm; tepals 2, yellowish green, orbicular, 3-8 × 3.5-9 mm; stamens 25-31; filaments free, 1-2 mm; anthers obovoid, 0.6-1.1 mm. Pistillate flowers: pedicel 0.6-2.6 cm; ovary oblong, 5-7 mm, glabrous, 3-loculed; placentae axile, bilamellate; tepals 2(or 3), yellowish green, broadly ovate, 3-7 × 4-10 mm; styles 3, fused to halfway, 2.1-3.3 mm; stigmas 2-cleft, slightly spiraled. Capsule pendulous, oblong-ovoid, 1.3-1.4 cm × 6-7 mm, unequally 3-winged; abaxial wing triangular, 1.1-1.4 cm; lateral wings smaller, 3-4 mm. Fl. Jul, fr. Aug.
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