Japan Flora: Thinly pubescent shrub, the second-year branches brownish, the bark longitudinally split and peeling; leaves ovate, to narrowly so or oblong, 5-8 cm. long, 2-3.5 cm. wide, long-acuminate, sparsely short-toothed, sometimes slightly pilose above, paler and nearly glabrous beneath except tufts of axillary hairs, the petioles 5-10 mm. long; racemes about 10-flowered; flowers white; calyx-tube and pedicels often puberulous; calyx-lobes ovate, acute, 4-5 mm. long; petals broadly ovate, 12-15 mm. long; styles pilose to glabrous. May-July.

Honshu, Shikoku, Kyushu.