Japan Flora: Scandent or trailing perennial, 40-80 cm. high, with short, slender, creeping rhizomes; stems slender, simple or sparingly branched, purplish; leaves deltoid-ovate to -lanceolate, 4-8 cm. long, 12-35 mm. wide, gradually acuminate, shallowly cordate to rounded at base, 3-nerved, deep green above, pale green and often purplish beneath, the petioles 5-15 mm. long; flowers pale blue-purple; calyx-tube 6-8 mm. long, narrowly 4- winged, the lobes linear, as long as to slightly longer than the tube; corolla about 3 cm. long, gradually narrowed at base, the lobes narrowly deltoid, plaited; fruit ellipsoid-globose, red- purple, about 8 mm. across, slightly exserted from the corolla, the stipe 1.5-2 cm. long; stigma linear-lanceolate. Aug.-Oct. Woods in mountains;

Hokkaido, Honshu, Shikoku, Kyushu. s. Kuriles, Sakhalin, Korea, Formosa, and China.