Crataegus altaica (Loudon) Lange var. villosa (Ruprecht) Lange; C. beipiaogensis S. L. Tung & X. J. Tian; C. maximowiczii var. ninganensis S. Q. Nie & B. J. Jen; C. sanguinea Pallas var. villosa Ruprecht.

Shrubs or small trees, to 7 m tall, unarmed or armed; thorns 1.5–3.5 cm. Branchlets purplish brown, terete, initially densely white pubescent, glabrescent; buds purplish brown, ovoid, glabrous. Stipules caducous, falcate, 5–8 mm, membranous, subglabrous, margin glandular serrate, apex acute or acuminate; petiole 1.5–2.5 cm, sparsely villous; leaf blade broadly ovate or rhombic-ovate, 4–6 × 3.5 cm, abaxially densely whitish villous, adaxially sparsely pubescent, base cuneate or broadly cuneate, occasionally truncate, margin remotely doubly serrate and with 3–5 pairs of lobes, apex acute. Compound corymb 4–5 cm in diam., many flowered; peduncle whitish villous; bracts caducous, linear-lanceolate, membranous. Pedicel 3–8 mm, whitish villous. Flowers ca. 1.2 cm in diam. Hypanthium campanulate, abaxially white pubescent. Sepals triangular-ovate or triangular-lanceolate, 3–4 mm, abaxially white pubescent. Petals white, suborbicular, ca. 5 mm. Stamens 20. Styles (2 or)3–5, pubescent basally. Pome purplish brown or red, globose, ca. 8 mm in diam., initially pubescent, later glabrous; fruiting pedicel 4–9 mm, initially densely white villous, glabrate when mature; sepals persistent, reflexed; pyrenes 3–5, with concave scars on both inner sides. Fl. May–Jun, fr. Aug–Sep. 2n = 32, 34*, 51*.

Near or in mixed forests, roadsides, river sides; 200--1000 m. Heilongjiang, Jilin, Liaoning, Nei Mongol [Japan, Korea, Mongolia, Russia (E Siberia)].