Japan Flora: Deciduous tree with glabrous branch lets; leaves oblong to ovate, 7-15 cm. long, 3-7 cm. wide, long-acuminate, usually cordate at base, glabrous except for axillary tufts of hairs beneath, serrulate with narrow, acute, simple or sometimes double small teeth, the glands near the top of the peti­ole; racemes 15-20 cm. long, rather densely many-flowered, glabrous, with few small leaves at base; flowers small, white, about 10 mm. across, the pedicels 7-10 mm. long; calyx with cup^shaped tube, the teeth short, semi-rounded, with minute glandular teeth; petals spreading, elongate-orbicular, 4-5 mm. long, nearly as long as the stamens, loosely toothed. May-June. Woods in mountains.

Hokkaido, Honshu (centr. distr. and northw.). Sakhalin, Manchuria, Ussuri, and s. Kuriles.