Rhizome horizontal, irregularly branched, subcylindric, 0.7--1 cm thick; cork light brown, rough; roots borne on lower side of rhizome, fibrous. Stem twining to left, grooved, smooth. Leaves alternate, simple; petiole 5--12 cm; leaf blade drying greenish, cordate to ± triangular-cordate, (3--)5--14 × 5--10.5 cm, adaxially glabrous, abaxially sometimes papilliferous along veins, basal veins 7 or 9, base cordate with rounded sinus, margin entire or sometimes undulate to obscurely lobed, apex acuminate or caudate. Male spikes solitary or paired, often branched, lax, to 7 cm, sometimes in lax, axillary panicles. Male flowers: solitary or in cymules of 2(--4); pedicel to 1.7 mm; bract and bracteole 1; perianth saucer-shaped, 3.5--4 mm in diam., outer lobes oblong, ca. 1 mm wide, apex rounded, inner ones ca. 0.7 mm wide; stamens 6, inserted at base of perianth, filaments curved outward. Female spike solitary, rarely paired, sometimes branched. Capsule reflexed at maturity, light brown, glossy, oblong-ellipsoid, 1.8--2.2 cm, base rounded, apex emarginate to truncate; wings 0.6--0.7 cm wide. Seeds inserted near base of capsule, winged ± all round but wing much wider toward capsule apex. Fl. Jun--Aug, fr. Aug--Oct.
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A yam with a rhizome which lies horizontal and is much branched. Stems twine to the left. The leaves are alternate and simple. The leaf stalks are 5-12 cm long. The leaves are triangle or heart shaped and 5-14 cm long by 5-11 cm wide.
Thickets in lowland and foothills all over Japan. Mixed forests, bamboo forests, usually along ravine sides from near sea level to 1,000 metres in China.
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It is a temperate plant. It grows in mixed forest from sea level to 1000 m altitude in China. In Sichuan.
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