Herbs, to 80 cm tall. Rhizomes elongate. Stems to 1.7 cm in diam. Leaves basal and cauline; stipules oblong, to 4 cm, glabrous, apex acute, acuminate, or cuspidate; petiole to 45 cm, densely minutely hairy; blade ovate or oblate-orbicular, asymmetric, 8-30 × 9-30 cm, densely minutely hairy when young, venation palmate, 7-9-veined, base slightly oblique, deeply cordate, margin irregularly denticulate, shallowly lobed, divided to 1/3 of leaf length; lobes 5-7, apex acuminate. Inflorescences subglabrous; bracts caducous, ovate, to 2 cm, glabrous. Staminate flowers: pedicel 0.6-1.9 cm; tepals 4, white, outer 2 ovate, 1.5-1.8 × 1.1-1.7 cm, glabrous, inner 2 obovate, 1.1-1.6 cm × 5.5-10 mm; stamens more than 200; filaments 2-4.2 mm; anthers oblong, 1.3-2.5 mm. Pistillate flowers: pedicel ca. 1.5 cm; tepals 5, white, unequal, largest ovate, 1.5-1.6 × 1.1-1.2 cm, smallest ca. 1.3 × 0.8 cm; ovary glabrous or minutely hairy when young, 2-loculed; placentae axile, bilamellate; styles 2, ca. 5.4 mm, free; stigmas 2-cleft, spiraled. Capsule nodding, oblong-elliptic, 1.8-2.1 cm × 7-10 mm, unequally 3-winged; abaxial wing broadly ligulate, 1.3-1.5 × 1-1.3 cm, apex obtuse; lateral wings smaller, 3-5 mm. Fl. May, fr. Jun. 2n = 22*.
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