Japan Flora: Tree with purplish brown branches glabrous or thinly white-pubesccnt while young; leaves simple, chartaceous, ovate to broadly so, elliptic or obovate, 5-10 cm. long, 3.5-7 cm. wide, abruptly acumi­nate, thinly pubescent above while young, pale green and thinly appressed-pubcscent beneath especially on the nerves while young, doubly toothed, the lateral nerves 8- to 10-paired, ascending, nearly straight, the petioles pubescent on the upper side while young, 10-20 mm. long, usually reddish; inflores­cences terminal on short branches, compound-corymbose, rather many-flowered, glabrous to sparsely white-pubescent; flowers white, 13-16 mm. across; calyx-teeth deltoid, obtuse, spreading, deciduous, white-pubescent inside; petals 5, orbicu­lar-ovate, slightly longer than the stamens; stamens about 20; styles 2, slighdy pubescent at base; fruit oblong, red, slightly lenticellate, 7-8 mm. long. May-June. Mountains.

Hokkaido, Honshu, Shikoku, Kyushu; common.

var. lobulata (Koidz.) Rehd.  Leaves shallowly lobulate. Honshu and Kyushu. Korea.

var. submollis Rehd. Leaves densely soft-pubescent beneath. Hokkaido, Honshu. Korea, Manchuria, China, and Ussuri.

Korea Flora: Deciduous shrub, 15m tall. Winter buds narrowly ovoid, apex acute, with 5-6 basal scales. Terminal buds larger than lateral buds (4-6mm long); branchlets with prominent lenticels. Leaf scars remain at the base of petioles, semicircular or V-shaped. Leaves alternate, simple, ovate or elliptic-ovate, gradually acuminate apex, rounded base, 5-10cm × 3.5-7cm; pubescent on veins of both surfaces but becoming glabrous over time, margins irregularly doubly serrate. Petioles 1-2cm long, initially pubescent but becoming glabrous. Inflorescences racemose, terminal on branches, with 6-10 flowers, 1cm in diameter, white; calyx lobes and petals each 5, stamens 20, styles 2, glabrous. Fruits samaras, elliptic, with distinct spots, 10mm in diameter, maturing to deep red.

Chromosome number: 34.
Flowering: May.
Fruiting: Mid-September to early October.
Distribution: Southern to northern and northeastern China, southern Far East Russia, throughout Japan; across the Korean Peninsula.