Japan Flora: Leaves broadly lanceolate to linear-lanceolate, 2-4 cm. long, 5-10 mm. wide, long-acuminate, acute at base, subtri­nerved, entire, petiolate; flowers short-pedicellate; calyx-tube 1.5-2 cm. long, 5-winged and often deeply fissured on one side, the lobes 4, broadly linear, 3-5 nun. long, laterally flattened and winglike; corolla 3-3.5 cm. long, shallowly 4- cleft, the lobes not plaited; style slender, 2-3 mm. long; cap­sules narrowly oblong, about 10 mm. long, the stipe slightly shorter than the capsule; seeds minute, thin-winged on margin. Sept.-Oct. Mountains;

Hokkaido, Honshu, Shikoku, Kyushu; rare. Korea, Manchuria, n. China, and Ussuri.