Herbs, erect. Rhizomes short, stout. Stems reddish brown to reddish, 70-120 cm, glabrous, branching twice or more. Leaves basal and cauline; stipules caducous, lanceolate, ca. 5 mm, membranous, glabrous; petiole 3-5 cm, glabrous or subglabrous; blade ovate-lanceolate, 5-12 × 1.8-4 cm, both surfaces sparsely hirsute, venation palmate-pinnate, base obliquely cordate, margin remotely serrulate, apex caudate-acuminate. Inflorescences glabrous, with few flowers; peduncle 2.5-5 cm, slender; bracts caducous, oblong, 3-4 × ca. 1 mm, membranous. Staminate flowers: tepals 4, pink, outer 2 broadly ovate, ca. 8 × 6 mm, outside sparsely hairy, inner 2 oblong, 5-8 × 3.5-4(-6) mm, glabrous; stamens numerous; filaments free, 1-1.5 mm; anthers obovoid, ca. 1 mm. Pistillate flowers: tepals 5, unequal, largest broadly ovate, ca. 1.2 × 1.1 cm, outside sparsely hairy, smallest oblong, ca. 8 × 5 mm, glabrous; ovary obovoid-oblong, sparsely hairy when young, 3-loculed; placentae axile, bilamellate; styles 3, free; stigmas 2-cleft, spiraled. Capsule nodding, unequally 3-winged; abaxial wing falcate, 1.3-2 × ca. 1 cm; lateral wings triangular, 5-7 mm. Fl. Aug, fr. Sep-Oct.
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