|Sorbus alnifolia subsp. var.||Korean mountain ash|
It is a medium-sized deciduous tree growing to 10–20 m tall with a trunk up to 30 cm diameter and grey bark; the crown is columnar or conic in young trees, becoming rounded with age, with branches angled upwards, and slender shoots. The leaves are green above, and thinly hairy with white hairs beneath, 5–10 cm long and 3–6 cm broad, simple, usually unlobed (but see varieties, below), broadest near the base, with serrated margins and an acute apex. The autumn colour is orange-pink to red. The flowers are 10–18 mm diameter, with five white petals and 20 yellowish-white stamens; they are produced in corymbs 4–8 cm diameter in late spring. The fruit is a globose pome 8–15 mm diameter, bright red, with a dimple at the apex; they are mature in mid autumn.
|Standard Cyclopedia of Horticulture|
Sorbus alnifolia, Koch (Micromeles alnifolia, Koehne. Pyrus Miyabei, Sarg.). Fig. 3652. Tree, to 60 ft., with upright branches: branchlets glabrous or slightly pubescent: lvs. ovate to elliptic-ovate, rounded at the base, short-acuminate, unequally serrate, glabrous above, glabrous or slightly pubescent beneath, on vigorous shoots sometimes densely pubescent, 2-4 in. long, with 6-10 pairs of veins: infl. loose, nearly glabrous, 6-12-fld.: fls. 1/3 – 1/2 in. across; ovary usually 2-celled: fr. sub-globose, 1/4 in. across, red with yellow. May; fr. in Sept., Oct. Cent. China, Manchuria, Korea, Japan.
Pests and diseases
- Sorbus alnifolia var. alnifolia. Leaves unlobed. Throughout the range of the species.
- Sorbus alnifolia var. angulata S.B.Liang. Leaves weakly lobed; fruit oblong. Northeast China, Korea.
- Sorbus alnifolia var. lobulata Rehder. Leaves weakly lobed; fruit globose. Shandong Province.
It has sometimes been placed in a separate genus of its own as Micromeles alnifolia, differing from other whitebeams in the deciduous sepals on the fruit (persistent in other whitebeams), but genetic evidence places it close to Sorbus aria.
- ↑ 1.0 1.1 1.2 Flora of China: Sorbus alnifolia
- ↑ 2.0 2.1 2.2 Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN 0-00-220013-9.