Leaves simple; petiole up to 15 cm. long, pubescence as on stems; leaf-lamina up to 15 × 16 cm., broadly transversely elliptic to very broadly ovate, usually 3-lobed up to halfway down, apiculate at the apex, margin subsinuate-dentate, cordate at the base, pubescence as on stems but sparse on upper surface; stipules 4 mm. long, broadly oblong to ± circular.
Cymes leaf-opposed and terminal; peduncle up to 3 cm. long with pubescence as on stems; pedicels up to 10 mm. long, becoming thickened and up to 13 mm. long in fruit, densely pubescent, becoming glabrous in fruit.
Liane; stems 4–5-angled with lax white crisped pubescence or glabrescent; tendrils 2–fid.
Fruit 17 × 10 mm. when dry, glabrous; seed 1, 15 mm. long, smooth with a single crest.
Stamens with filaments 0·5 mm. long; anthers 1 mm. long.
Ovary glabrous; style 1 mm. long; stigma subcapitate.
Calyx c. 1·5 mm. long, densely pubescent when young.
Bracts and bracteoles up to 1·5 mm. long, pubescent.
Flower-bud 4·5 × 2·5 mm., glabrous.