陕甘花楸 sha gan hua qiu

Pyrus koehneana (C. K. Schneider) Cardot; Sorbus multijuga Koehne var. microdonta Koehne; S. valbrayi H. Léveillé.

Shrubs or small trees, 1.5–4 m tall. Branchlets dark gray or blackish gray, terete, slender, glabrous, with few lenticels; buds narrowly ovoid, 5–10 mm, apex acute or ± obtuse; scales several, reddish brown, glabrous or brown pubescent only apically. Leaves imparipinnate, together with rachis 10–16 cm; petiole 1–2.5 cm; stipules caducous, lanceolate, 6–7 mm, submembranous, margin serrate, rarely entire; rachis adaxially sulcate, puberulous or subglabrous, slightly winged; leaflet blades 8–12-paired, rarely more, at intervals of 7–12 mm, grayish green abaxially, oblong to oblong-lanceolate, 1.5–3 × 0.5–1 cm, lateral veins 9 or 10 pairs, abaxially puberulous or subglabrous only along midvein, papillose, adaxially glabrous, base obliquely rounded, margin coarsely serrate except at base, with 10–14 teeth per side, apex obtuse or acute. Compound corymbs terminal, 5–9 × 4–6(–10) cm, many flowered; rachis and pedicels sparsely white pubescent, nearly glabrous when old; bracts caducous, linear or lanceolate, 5–6 mm. Pedicel 1–2 mm. Flowers 8–9 mm in diam. Hypanthium campanulate, glabrous. Sepals triangular, shorter than petals, apex obtuse. Petals white, 4–6 × 3–4 mm, adaxially puberulous or subglabrous, base shortly clawed. Stamens 20, ca. 1/3 as long as petals. Styles 5, nearly as long as stamens, ± free at base, puberulous or subglabrous. Fruit white, globose, 6–8 mm in diam.; sepals persistent. Fl. May–Jun, fr. Aug–Sep. 2n = 34*, 68*.

Mixed forests in mountain regions, thickets; 2300--4000 m. Gansu, Henan, Hubei, Qinghai, Shaanxi, Shanxi, Sichuan, W Yunnan.