Japan Flora: De­ciduous tree; leaves obovate to elliptic or narrowly obovate, 5-9 cm. long, 3-6 cm. wide，abruptly acuminate, obtuse to rounded at base, acutely toothed, glabrous or with few axillary tufts of hairs beneath, the petioles 10-15 mm. long, glabrous, with glands at the top; racemes 10-12 cm. long, rather many­flowered, glabrous to puberulent; flowers white, 12-15 mm. across, the pedicels 8-12 mm. long; calyx with broadly ob- conical tube, the lobes ovate, glandular-toothed; petals 5-6 mm. long, orbicular, loosely toothed; stamens short.  May-July.

Hokkaido. Korea, Sakhalin, and widely distributed in temperate regions of the Old World.