Japan Flora: Tree with glabrous or thinly pubescent young branchlets; leaves pinnate, 15-20 cm. long, the petioles 3-5 cm. long, glabrous or nearly so, the leaflets 多-15, lanceo­late to narrowly ovate-oblong, 3-7 cm. long, 1-2.5 cm. wide, long-acuminate to acuminate, glabrous or nearly so, pale to whitish and sometimes slightly pubescent on the midrib be­neath, with acuminate teeth, the lateral nerves slender; in­florescence 5-10 cm. across, densely many-flowered, glabrous or loosely brown-pubcscent at anthesis, becoming glabrous in fruit; flowers white, 6-8 mm. across; calyx glabrous, the teeth erect or only slightly incurved in fruit; petals spreading, nearly orbicular, short-clawed, often thinly puberulent inside at base, as long as the stamens; fruit red, 4-5 mm. across, glo­bose. May-July. Mountains.

Hokkaido, Honshu, Shi­koku, Kyushu.

var. rufoferruginea C. K. Schneid. Inflorescence, the calyx­ tube at anthesis, and the leaves beneath along the midrib with long, soft, brown hairs. Mountains; Honshu, Shikoku, Kyushu.

var. sachalinensis Koidz. Leaflets larger, to 8-9 cm. long. Hokkaido. s. Kuriles and Sakhalin.

Sorbus X rikuchuensis Makino. Leaves pinnately divided on lower half, pinnately parted to lobed on upper half, 4-8 cm. wide, glabrous on upper side, irregularly toothed, pubescent beneath, brown-pubescent on nerves be­neath, 6-12 cm. long, the leaflets and lobes chartaceous, spread­ing. Honshu (Rikuchu Prov.); rare; a hybrid involving S. commixta and an unknown second parent. Hybrids of uncertain origin occurring in Honshu