Herbs, to 85 cm tall. Rhizomes elongate. Stems erect, sparsely villous when young. Leaves basal and cauline; stipules oblong, 1.6-1.8 cm, subglabrous, apex acuminate and cuspidate; petiole 6.5-16 cm, pilose when young; blade broadly ovate to suborbicular, asymmetric, 7-15 × 9-18 cm, abaxially brownish pubescent, adaxially sparsely setulose, venation palmate, 6-8-veined, base shallowly cordate, margin irregularly denticulate, distinctly divided; lobes obliquely rhombic-ovate, 3-8 × 2-5.5 cm, apex long acuminate or caudate. Inflorescences pilose or subglabrous when young; peduncle ca. 1.5 cm. Staminate flowers: pedicel ca. 1.5 cm; tepals 4, outer 2 broadly ovate, 1.3-1.5 × 1.1-13 cm, abaxially pilose, inner 2 broadly elliptic or broadly ovate, 11-12 × 8-9 mm; stamens numerous; filaments entirely fused or nearly so. Pistillate flowers unknown. Capsule nodding, ca. 18 × 9 mm, 2-loculed; placentae axile, bilamellate; unequally 3-winged; abaxial wing broadly ligulate, 1.5-1.8 × ca. 1.3 cm, apex rounded; lateral wings 6-8 mm. Fl. Jul, fr. Aug.
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