Herbs. Rhizomes poorly developed. Stems 40-70 cm tall, to 1.4 cm in diam. Leaves cauline; stipules caducous, lanceolate to ovate, 1.8-2.4 × 1.2-1.5 cm, glabrous, margin entire, apex acuminate; petiole glabrous, 5-14 cm; blade lanceolate to narrowly ovate, 9-18 × 4-7 cm, glabrous, venation palmate-pinnate, 6-9-veined, base oblique, cordate, margin irregularly serrulate, apex acuminate. Inflorescence 6-14 cm; peduncle to 11 cm; bracts caducous, narrowly ovate to ovate, 0.9-2.1 cm × 5-15 mm, thickly papery, glabrous, margin entire, apex acuminate. Staminate flowers: tepals 4, white or pinkish, outer 2 orbicular, 1.1-1.8 × 0.8-1.8 cm, inner 2 oblanceolate to narrowly obovate, 0.9-1.6 cm × 4-9 mm; stamens 41-53; filaments 2-2.8 mm; anthers narrowly oblong, 2.4-2.9 mm. Pistillate flowers: tepals 5(or 6), white or pinkish, unequal, narrowly obovate to orbicular, largest 0.9-1.6 cm × 7-15 mm, smallest 6-13 × 4-7 mm; ovary ellipsoid, locules 2; placentae axile, bilamellate; styles 2, fused at base; stigmas 2-cleft, spiraled. Capsule trigonous, unequally 3-winged; abaxial wing 1.5-2.5 × 1.5-2.3 cm; lateral wings smaller. 2n = 52*.
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