Herbs. Rhizomes elongate, creeping, to 2 cm in diam. Leaves arising from rhizome; stipules triangular, 2.8-3 × 1.7-1.9 cm, glabrous, margin entire, apex acuminate or cuspidate, persistent; petiole greenish, to 24 cm, glabrous, base reddish brown, swollen; blade green, peltate, ovate, slightly asymmetric, 14-21 × 8-14 cm, glabrous, venation palmate, base rounded, margin entire or nearly so, apex acuminate, shortly caudate. Inflorescences 17-45 cm, glabrous; peduncle 34-37 cm; bracts reddish brown, narrowly ovate, 2-2.5 × 0.9-1.2 cm, glabrous, margin entire, apex acute to acuminate. Tepals pinkish, glabrous. Staminate flowers: pedicel 2.2-3.5(-4.8) cm; tepals 4, glabrous, outer 2 broadly ovate, 2.3-2.8 × 2.2-2.5 cm, inner 2 oblanceolate, 16-18 × 5-8 mm, apex obtuse; stamens more than 100; filaments nearly free, 3-5 mm; anthers obovoid, ca. 1 mm, apex truncate or subemarginate. Pistillate flowers: pedicel 1.3-1.5 cm; tepals 3, glabrous, outer 2 depressed-ovate, 1.8-2 × 2.4-2.6 cm, inner 1 oblanceolate, 1.2-1.4 × 4-5 mm; ovary glabrous, unequally 3-winged, 3-loculed; placentae axile, bilamellate; styles 3, 4-4.5 mm, fused at base; stigmas 2-cleft, in a spiraled band. Infructescences 17-45 cm; capsules nodding, ca. 3.1 cm, unequally 3-winged; abaxial wing lunate, ca. 5 mm; lateral wings smaller, 2-3.5 mm.
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