Herbs. Rhizomes elongate, stout, to 3.5 cm in diam. Leaves basal; stipules caducous, 1.2-2.7 × 1.2-1.5 cm, membranous; petiole 20-35 cm, glabrous; blade broadly ovate, asymmetric, 23-26 × 32-34 cm, glabrous, venation palmate, 10-or 11-veined, base oblique, cordate, margin irregularly remotely serrulate, apex rounded or acute. Inflorescences glabrous. Staminate flowers: pedicel 1.5-2.2 cm; tepals 4, white, outer 2 ovate, 9-13 × 10-16 mm, inner 2 ovate, 9-16 × 8-11 mm; stamens ca. 200; filaments 3.3-6.7 mm; anthers 1.8-2.5 mm. Pistillate flowers: pedicel 1.5-2 cm; tepals 5, white, unequal, broadly ovate to ovate, largest 12-14 × 9-10 mm, smallest 14-15 × 8-11 mm; ovary glabrous, 2-loculed; placentae axile, bilamellate; styles 2, free, ca. 6.8 mm; stigmas 2-cleft, spiraled. Capsule nodding, unequally 3-winged; abaxial wing ligulate, ca. 1.2 × 6-7 cm, apex obtuse; lateral wings lunate, ca. 3 mm. Fr. Oct.
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