Japan Flora: Perennial with short crisped hairs, especially on the leaves beneath; stems scandent, branched, slender; leaves membranous, narrowly ovate-deltoid or broadly ovate, 5-9 cm. long, 2-4 cm. wide, gradually acuminate, shallowly cordate at base, the petioles 1-3 cm. long; inflorescence umbel­like, the peduncles 0-2 cm. long, the pedicels slender, 1-1.5 cm. long; flowers white, 10-15 mm. across; corolla-lobes lance­olate, gradually narrowed to the tip, obtuse, 7-8 mm. long; corona-lobes broadly ovate, obtuse, yellowish, as long as the gynostegium; follicles broadly lanceolate, 5-6 cm. long, 7-8 mm. wide, glabrous; seeds broadly ovate, 6-7 mm. long, nar­rowly winged, with dark brown spots. Aug.-Sept. 

Kyu­shu (s. distr).