10. Crataegus aurantia Pojarkova, Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 13: 82. 1950.
桔红山楂 jie hong shan zha
Shrubs or small trees, deciduous, 3–5 m tall, unarmed or armed; thorns 1–2 cm. Branchlets dark purple when young, grayish brown when old, initially pubescent; buds not seen. Stipules not seen; petiole 1.5–2.5 cm, densely pubescent; leaf blade dark green adaxially, broadly ovate, 4–7 × 3–7 cm, abaxially pubescent, densely so along midvein and veins, adaxially sparsely pubescent, base rounded, truncate, or broadly cuneate, margin sharply and irregularly serrate, with 2 or 3 pairs of shallow lobes; lobes broadly ovate to suborbicular, apex acute. Compound corymb 3–4 cm in diam., many flowered; peduncle densely pubescent; bracts not seen. Pedicel 5–8 mm, densely pubescent. Flowers ca. 1 cm in diam. Hypanthium campanulate, abaxially pubescent. Sepals broadly triangular, 4–6 mm, abaxially pubescent. Petals white, suborbicular, ca. 5–6 mm. Stamens 18–20. Ovary 2- or 3-loculed, with 2 ovules per locule; styles 2 or 3 rarely 4, pubescent basally. Pome orangish red when dried, oblong-ovoid when young, subglobose when mature, ca. 1 cm in diam., glabrous; sepals persistent, reflexed; pyrenes 2 or 3, abaxially convex, adaxially with concave scars. Fl. May–Jun, fr. Aug–Sep.
Mixed forests on slopes; 1000--1800 m. Gansu, Hebei, Shaanxi, Shanxi.