Herbs, rhizomatous. Rhizomes creeping, 1.5-2.3 cm in diam. Leaves all basal; stipules triangular, manifestly keeled; petiole 10-30 cm, hirsute-villous; blade abaxially pale green, adaxially with broad blackish brown (red abaxially) bands along main veins, obliquely broadly ovate to suborbicular, 10-25 × 9-20 cm, abaxially sparsely villous or hispid on veins, adaxially with many hairy tipped pustules, sparsely long setose or hirsute, basally 5-7-veined, base deeply cordate, margin densely denticulate, apex acuminate or shortly caudate. Inflorescences axillary; peduncle 10-54 cm, sparsely glandular pilose; pedicel 5-14 mm; bracts and bracteoles ovate or oblong to lanceolate, 3-5 × 2-3 mm, membranous, margin glandular ciliate, apex acute, caducous; flowers 20-100 in a dichasial cyme. Staminate flower: tepals 4, outer 2 broadly ovate or suborbicular, 5-11 × 6-12 mm, inner 2 oblong, 5-8 × 2-4.5 mm, apex obtuse; androecium actinomorphic; stamens 40-55; anthers obovoid, apex truncate or subemarginate. Pistillate flower: tepals 3, outer 2 broadly ovate, oblong-obovate or suborbicular, (6-)8-12 × (4-)7-13 mm, abaxially glandular hispid, apex rounded, inner 1 oblong or obovate, 5-7.5 × 2-4.5 mm, apex obtuse; ovary oblong, red glandular hispid, placentae parietal; styles 3. Capsule nodding, oblong to ellipsoid, 9-13 × 5-6 mm, reddish, glandular hispid, unequally 3-winged, largest wing obliquely lunate or ligulate, 4-9 mm. Fl. Mar-Sep, fr. Jun-Sep.
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