Description from Flora of China
Prunus trichostoma Koehne in Sargent, Pl. Wilson. 1: 216. 1912; P. latidentata Koehne; P. latidentata var. trichostoma (Koehne) C. K. Schneider; P. lobulata Koehne; P. pleuroptera Koehne.
Trees (1.5–)2–10 m tall. Bark grayish black. Branchlets grayish brown; young branchlets glabrous or pilose. Winter buds ovoid to long ovoid, glabrous. Stipules lanceolate to linear, 3–5 mm, margin 2-or 3-serrate or lobed, teeth acute to acuminate. Petiole 6–8 mm, glabrous or pilose; leaf blade ovate, obovate, or elliptic-lanceolate, 1.5–3 × 0.5–2 cm, abaxially pale green and pilose along veins or sometimes between veins, adaxially dark green and pilose or glabrous, base cuneate, broadly cuneate, or subrounded, margin acutely incised biserrate with teeth non-glandular or with a minute apical gland, apex acute to acuminate; secondary veins 6–10 on either side of midvein. Inflorescences (1-or)2(or 3)-flowered; involucral bracts brown, obovate-elliptic, abaxially glabrous, adaxially densely appressed hairy; peduncle to 5 mm or absent; bracts brown, rarely greenish brown, usually soon caducous, rarely persistent in fruit, margin glandular serrate. Flowers opening at same time or rarely slightly before leaves. Pedicel 0.8–2 cm, 1–2.5 cm and apically thickened in fruit, glabrous or pilose. Hypanthium campanulate, 5–6 × 3–4 mm, outside glabrous or pilose. Sepals triangular to ovate, 2–3 mm, inside glabrous or appressed pilose, margin glandular serrate, apex acute to obtuse. Petals white or pale pink, obovate, apex rounded. Stamens 25–36, shorter than petals. Style ± as long as stamens, basally pilose. Drupe purplish red, ovoid, 7–8 mm in diam.; endocarp markedly sculptured. Fl. Apr–May, fr. Jun–Jul.
Alpine forests, thickets on rocky slopes; 1000--4000 m. Gansu, Qinghai, Sichuan, Xizang, Yunnan.