裂叶山楂 lie ye shan zha

Trees small, 5–6 m tall, usually thorny; thorns 0.6–2.5 cm, slender. Branchlets purplish brown when young, dark purple when old, terete, stout, glabrous or slightly glaucous; buds purplish brown, suborbicular, glabrous. Stipules caducous, falcate or cordate, ca. 8 mm, herbaceous, glabrous, margin thickened serrate, apex acute-acuminate; petiole 1.5–2.5 cm, glabrous; leaf blade broadly ovate, 4–6 × 3–4.5 cm, both surfaces glabrous or only abaxially pubescent in vein axils, base cuneate or broadly cuneate, margin remotely and sharply serrate, and with 2–4 pairs of lobes near base, often nearly divided to midvein; lobes ovate or ovate-lanceolate, apex acute or shortly acuminate. Corymb 6–7 cm in diam., many flowered; peduncle glabrous, slightly glaucous; bracts caducous, linear, membranous. Pedicel 5–6 mm, glabrous, glaucous. Flowers ca. 1.2 cm in diam. Hypanthium campanulate, abaxially glabrous, glaucous. Sepals triangular, 2–3 mm, both surfaces glabrous. Petals white, broadly obovate, ca. 5–6 × 3–4 mm. Stamens 20. Ovary densely pubescent apically, 4- or 5-loculed, with 2 ovules per locule; styles 4 or 5. Pome red, globose, 4–8 mm in diam., glabrous; sepals persistent, reflexed; pyrenes 3–5, with deep concave scars on both inner sides. Fl. May–Jun, fr. Jul–Aug.

Slopes, stream sides, roadsides. C and W Xinjiang.