Japan Flora: Densely branched deciduous shrub, the branches, leaves, pedicels and capsules strigose; leaves ovate, oblong, or elliptic, 7-25 mm. long, 4-12 mm. wide, acute to subacute at both ends, sessile or subsessile; flowers 2-5, white, terminal, the pedicels 3-8 mm. long； corolla short-tubular to infundibuliform-campanulate, 6-8 mm. long, 5-10 mm. across, glabrous, but puberulent inside at the base, the lobes 4 or 5, sometimes shorter than the tube; stamens 4 or 5, slightly exserted, the filaments pubescent at base; style 2-10 mm. long; ovary 4- or 5-locular; capsules ovoid-conical, obtuse, 4-5 mm. long, 3-4 mm. across. July. Rocky places in mountains;

Hokkaido, Honshu, Shikoku, Kyushu. Korea (Mount Chiisan).