Japan Flora: Stems 50- 100 cm. long, scandent, puberulent or nearly glabrous, with the largest leaves below the middle, those above remote and smaller; larger leaves thinly membranous, sparsely puberulent, ovate-orbicular to ovate or broadly elliptic, 12-25 cm. long, 10-15 cm. wide, abruptly acuminate, rounded to subacute at base, the petioles 3-6 cm. long; inflorescence axillary and termi­nal, usually short-pedunculate, much branched, rather large, puberulent, the pedicels 1-2 cm. long; calyx-segments lanceo­late, acuminate; corolla purple-brown or dark purple, 8-10 mm. across, the lobes lanceolate, obtuse, white crisped-pubes- cent inside; follicles spreading to slightly deflexed, linear- lanceolate, usually puberulent, 5-8 cm. long, about 4 mm. wide; seeds broadly lanceolate, about 12 mm. long, flat, wing­less, smooth. Mountains.

Honshu (w. distr.), Shikoku, Kyushu.

var. nikoense (Maxim.) Ohwi. Inflorescence short, rather fe'v-flo'vered; follicles more puberulent. Woods in mountains; Honshu, Shikoku.