Herbs, 26-35(-39) cm tall. Rhizomes poorly developed, 8-10 mm in diam. Stems subglabrous, sometimes branching. Leaves cauline; stipules caducous, ovate-lanceolate, ca. 7 mm, membranous, subglabrous, apex obtuse; petiole 2-4 cm, subglabrous; blade triangular-ovate, asymmetric, 7-12 × 4.5-7 cm, abaxially glabrous or sparsely hispidulous, adaxially sparsely hispidulous, base oblique, cordate, margin irregularly denticulate, very shallowly lobed, apex acuminate or caudate-acuminate. Inflorescences 3.5-7 cm, glabrous; bracts lanceolate, 6-8 mm, membranous. Staminate flowers: pedicel 1-1.2 cm; tepals 4, pinkish, outer 2 narrowly ovate, 1-1.3 cm, abaxially villous, inner 2 elliptic, ca. 3 × 1.5 mm; stamens numerous; filaments ca. 2 mm, fused to halfway; anthers oblong, ca. 0.8 mm. Pistillate flowers: pedicel 1-1.2 cm; tepals ?3, pinkish, unequal, largest broadly ovate, ca. 10 × 9 mm, glabrous, smallest elliptic, ca. 5 × 2 mm; ovary glabrous, 3-loculed; placentae axile, bilamellate; styles 3; stigmas U-shaped, slightly spiraled. Capsule pendulous, ellipsoid, 9-11 × 5-6 mm, unequally 3-winged; abaxial wing narrowly triangular or falcate, ca. 1 cm; lateral wings smaller. Fl. Jul-Aug, fr. Aug.
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