Vines, perennial, not rhizomatous, 3-10 m. Stems climbing, branched from near base, woody, glabrous, not glaucous. Leaves: ocrea usually deciduous, hyaline or brownish, cylindric, 3-8 mm, margins truncate to oblique, face glabrous throughout; petiole 1-4 cm, glabrous or scabrid; blade narrowly ovate to ovate-oblong, 3-10 × 1-5 cm, base subcordate or cordate to sagittate, margins entire or wavy, glabrous or scabrid, apex obtuse to acuminate, abaxial face glabrous or scabrid along midvein, rarely minutely dotted, not glaucous, adaxial face glabrous. Inflorescences axillary and terminal, spreading or drooping, paniclelike, 3-15 cm, axes glabrous or papillate to scabrid in lines; peduncle 1-3 cm, glabrous or scabrid. Pedicels ascending or spreading, articulated proximal to middle, 1.5-4 mm, glabrous or scabrid. Flowers bisexual, 3-6 per ocreate fascicle; perianth accrescent in fruit, greenish white with white wings or mostly pink, sometimes bright pink in fruit, 5-8 mm including stipelike base, glabrous; tepals elliptic, apex obtuse to rounded, outer 3 winged; stamens 6-8; filaments flattened proximally, pubescent proximally; styles connate basally; stigmas peltate. Achenes included, dark brown to black, 2-4 × 1.8-2.2 mm, shiny, smooth; fruiting perianth glabrous, wings flat to undulate, 2-4 mm wide at maturity, decurrent on stipelike base nearly to articulation, margins entire. 2n = 20 (Korea).
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Flowers pedicellate, in whorls of 3 or more in the axils of bracts; whorls arranged in terminal panicles of many slender racemes 3–10 cm long; pedicels 4–10 mm long, filiform, articulated below the middle; bracts up to 2 mm long.
Leaves petiolate; lamina pale green, 2.5–10 × 1.5–6 cm, ovate, obtuse or ± acuminate to the apex, cordate or sagittate at the base, dentate or crenate on the margin.
Perianth white, pinkish or bright pink, 4–7 mm long, the 3 outer segments ovate, broadly decurrently winged in fruit.
Stems branched; stems and branches glabrous, sometimes with papillose branches.
Ovary 2–3 mm long; stigmas sessile, peltate, ± fimbriate on the margin.
Filaments filiform, slightly enlarged toward the base and papillose.
A vigorous woody climber, up to 5 m high or more.
Nut black, smooth, glossy, 3–4.5 mm long.
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