Herbs, erect. Rhizomes short, stout. Stems 0.5-1.5 m tall, well branched. Leaves cauline; stipules caducous, narrowly to broadly ovate, to 2.4 × 1.9 cm, glabrous, apex acuminate; petiole 8-15 cm, glabrous or subglabrous; blade lanceolate to broadly lanceolate, asymmetric, 8.5-29 × 3.4-11 cm, glabrous or subglabrous, venation palmate-pinnate, 7-10-veined, base oblique, cordate, margin remotely and irregularly denticulate. Inflorescences strongly reduced, to 5 cm, pendulous; bracts caducous, ovate to narrowly triangular, to 1.9 × 1.2 cm, thickly papery, glabrous, margin entire, apex mucronate to acuminate. Staminate flowers: pedicel 5-12 mm; tepals 4, white, outer 2 oblong to very broadly ovate, 0.9-1.3 cm × 5-10 mm, glabrous, inner 2 elliptic, 0.6-1.5 cm × 4-8.2 mm; stamens 49-93; filaments free, 0.7-2.5 mm; anthers lorate to broadly lorate, 1.7-2.6 mm, apex emarginate. Pistillate flowers: pedicel 5-12 mm; tepals 6, white, subequal, broadly elliptic to orbicular, 7-12 × 5-9 mm; ovary glabrous, 3-loculed; placentae axile, bilamellate; styles 3, fused at base; stigmas 2-cleft, spiraled. Capsule pendulous, subglobose, 1.1-1.8 cm in diam., wingless or 3-horned. Fl. Apr-May, fr. Jul. 2n = 22*.
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A herb. It grows 2 m tall. It has short stout rhizomes. The stems are erect and branched. They are reddish-green. The leaves are sword shaped and oblique. They are 11-22 cm long by 2-11 cm wide. They taper to a long tip. The base is heart shaped. There are shallow teeth along the edge. They are shiny green above and more pale underneath. The leaf stalks are 15 cm long. The flowers are in groups of about 10 and are white to pale pink. The fruit is a flattened round capsule 1.5 cm across that hangs down.