17. Malus komarovii (Sargent) Rehder, J. Arnold Arbor. 2: 51. 1920.
山楂海棠 shan zha hai tang
Crataegus komarovii Sargent, Pl. Wilson. 1: 183. 1912; M. komarovii var. funiushanensis S. Y. Wang.
Shrubs or small trees, to 3 m tall. Branchlets dark red when young, reddish brown or purplish brown when old, terete, pubescent when young, glabrous when old; buds dark red, ovoid; scales pubescent at margin. Stipules caducous, linear-lanceolate, 4–6 mm, membranous, margin glandular denticulate, apex acuminate; petiole 1–3 cm, pubescent; leaf blade broadly ovate, rarely narrowly elliptic, 4–8 × 3–7 cm, abaxially densely pubescent along veins when young, adaxially sparsely pubescent, base cordate or subcordate, margin doubly serrate, usually 3-parted at middle, 1-lobed on each side near base, irregularly lobed or undivided apically, apex acuminate or acute. Corymb 4–6 cm in diam., 6–8-flowered; bracts caducous, linear-lanceolate, membranous, margin sparsely glandular serrate, apex acuminate. Pedicel ca. 2 cm, villous. Flowers ca. 3.5 cm in diam. Hypanthium campanulate, abaxially tomentose. Sepals triangular-lanceolate, 2–3 mm, slightly longer than hypanthium, abaxially subglabrous, adaxially tomentose, margin entire, apex acuminate. Petals white, obovate, ca. 1.8 cm, base shortly clawed, apex rounded. Stamens 20–30, ca. 1/2 as long as petals. Ovary 3- or 4-loculed, with 2 ovules per locule; styles 3 or 4, slightly longer than stamens, glabrous basally. Pome red, ellipsoid, 1–1.5 × 0.8–1 cm, core free at apex; sepals caducous; fruiting pedicel 1.2–1.5 cm. Fl. May, fr. Sep. 2n = 34*.
Among shrubs; 1100--1300 m. S Jilin (Changbai Shan) [N Korea].
This species is resistant to cold temperatures. It is also endangered because of habitat loss.