Japan Flora: Stems branched, scandent, minutely crisped-pubescent while young, glabrescent; leaves membranous, ovate-cordate, abruptly short- caudate, vivid green above, whitish beneath, the petiole shorter than the blade; cymes racemelike, many-flowered, the peduncles 2-2.5 times as long as the petioles, the pedicels slen­der, 1-2 cm. long, puberulent on inner side; flowers white; calyx-segments ovate, obtuse; corolla-lobes slightly reflexed, with revolute margins, narrowly oblong, 4-5 mm. long, obtuse, puberulent inside; corona yellow, the lobes highly adnate to the gynostegium for more than half the length of the corolla; follicles 8-10 cm. long, 8-10 mm. wide, usually solitary; seeds obcuneate-ovate, 7-8 mm. long, flat, winged, rounded and toothed on basal margin. July-Aug.

Hokkaido, Honshu, Shikoku, Kyushu. s. Kuriles and China.