Japan Flora: Scandent shrub; branches reddish brown, prominently warty, slightly angled, glabrous; leaves ovate to broadly so, or elliptic, 5-15 cm. long, 4-10 cm. wide, abruptly acuminate to acute, rounded at base, obtusely serrate, vivid green, glabrous on upper side, sometimes papillose-pilose on nerves beneath, the petioles 1.5-3 cm. long; panicles 10-25 cm. long, the branches and branchlets papillose-puberulous; flowers greenish white, 5-6 mm. across; calyx-lobcs obtusely deltoid; petals elliptic, nearly as long as the stamens; fruit broadly lanceolate, with 3 elliptic or cordate wings, 12-18 mm. long and as wide inclusive of the wing, retuse to cordate at both ends, pale green, glabrous. July-Aug. Mountains;

Honshu (Japan Sea side from centr. distr. northw., and Kii Prov.), Shikoku, Kyushu. Korea and Manchuria.