Herbs, erect. Rhizomes short. Stems to 45-90 cm tall, glabrous. Leaves all cauline; stipules caducous, narrowly ovate to ovate, to 2.8 × 2 cm; petiole 6-26 cm, glabrous; blade abaxially purple-red, adaxially usually dark green, lanceolate to narrowly ovate, asymmetric, 9-33 × 5-14 cm, remotely scaberulous, venation palmately-pinnate, 7-10-veined, base oblique, cordate, margin irregularly serrulate, apex acuminate to cuspidate. Inflorescences glabrous, 6-13 cm; peduncle to 9 cm; bracts caducous, narrowly ovate, to 2.4 × 1.5 cm, glabrous. Staminate flowers: tepals 4, white or pinkish, outer 2 obovate to very broadly ovate, 0.7-1.5 cm × 6-13 mm, inner 2 oblanceolate to narrowly obovate, 0.6-1.4 cm × 5-11 mm; stamens 64-89; filaments 1.2-1.9 mm; anthers narrowly oblong, 1.9-2.2 mm. Pistillate flowers: tepals 5(or 6), white or pinkish, glabrous, unequal to subequal, narrowly obovate to broadly ovate, largest 0.8-1.4 × 0.7-1.3 cm, smallest 7-12 × 3-7 mm; ovary glabrous, 3-loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas 2-cleft, spiraled. Capsule pendulous to nodding, ovoid, 1.2-1.5 cm, unequally 3-winged; abaxial wing 1.6-2.2 cm; lateral wings smaller. 2n = 52*.
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