Rhizome horizontal, irregular. Stem twining to left, glabrous. Leaves alternate, sometimes 3-or 4-whorled at stem base, simple; petiole 7--12 cm; leaf blade drying green or brownish, cordate, 10--18 × 6.5--11 cm, pruinose, glabrous, basal veins 7 or 9, base broadly cordate or subtruncate, margin entire or slightly undulate, apex acuminate. Male spike irregularly branched, laxly few flowered; rachis slender. Male flowers: solitary, rarely in cymules of 2 or 3 at inflorescence base, sessile; bracts ovate, membranous; bracteoles shorter and narrower than bracts; perianth saucer-shaped, lobes oblong-orbicular, 1.5--2 mm; stamens 3, anther connective ca. 1/2 as wide as anther; staminodes 3, inserted at margin of receptacle, clavate. Female spike solitary, laxly few flowered, to 7 cm. Female flowers: staminodes 6. Capsule reflexed, brown, oblong-ovoid, 2--2.2 cm, apex truncate; wings 1--1.1 cm wide. Seeds inserted near middle of capsule, ca. 1 cm in diam. (ca. 0.5 cm excluding wing), winged all round. Fl. May--Aug, fr. Jun--Oct.
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