Lianas 1-3 m. Branchlets and petioles minutely tomentose when young, glabrescent. Petiole ca. 6 cm; leaf blade broadly ovate or orbicular, 6.5-15 × 6-13 cm, thick papery, base shallowly cordate to subtruncate, apex short acuminate, sparsely tomentose to glabrous. Inflorescences umbel-like or condensed paniclelike, 5-7 cm, many flowered; peduncle nearly as long as petiole. Pedicel 1-1.5 cm. Sepals ovate; glands 5. Corolla white, subcampanulate; tube tomentose inside; lobes oblong ca. 3 × 2 mm, ciliate. Corona lobes lanceolate, fleshy, shorter than anthers. Anthers ± square; pollinia oblong. Stigma head discoid, apex conical. Follicles fusiform, ca. 7 × 2 cm; pericarp woody, glabrous. Seeds ovate, ca. 1 cm; coma ca. 1 cm. Fl. Apr.

Thickets. Taiwan [Japan, Korea].