多对花楸 duo dui hua qiu

Sorbus multijuga var. microdenta Koehne.

Shrubs or small trees, 2.5–5(–7) m tall. Branchlets reddish brown when young, gray or blackish gray when old, terete, puberulous when young, glabrous when old, with small oblong lenticels; buds narrowly ovoid, 5–7 mm, puberulous or glabrous, apex shortly acuminate; scales dark purplish red. Leaves imparipinnate, together with rachis 8–13 cm; petiole 1–2 cm; stipules lanceolate, 5–7 mm, herbaceous, rarely submembranous, margin incised-serrate, apex acuminate; rachis puberulous abaxially, glabrescent, somewhat winged, adaxially grooved; leaflet blades 17–21-paired, at intervals of 5–10 mm, grayish green abaxially, oblong or oblong-lanceolate, 1–2.5 × 0.5–1 cm, lateral veins 8–10 pairs, abaxially pilose only along midvein, adaxially glabrous, base obliquely rounded, margin with 6–16 minute sharp teeth per side, entire near base, apex acute or ± obtuse. Compound corymbs terminal, 5–9 × 3–7 cm, 10–30-flowered; rachis and pedicels initially sparsely pilose, glabrescent or subglabrous when mature; bracts lanceolate. Pedicels 2–4 mm. Flowers 5–6 mm in diam. Hypanthium campanulate, glabrous or sparsely pubescent. Sepals ovate, glabrous, apex acute or ± obtuse. Petals white, ovate, 4–4.5 × 3–4 mm, adaxially puberulous or subglabrous, base shortly clawed, apex obtuse. Stamens 15–20, slightly shorter than petals. Styles 3–5, basally connate, nearly as long as stamens, glabrous. Fruit white, globose, 6–7 mm in diam., with persistent erect sepals. Fl. May–Jun, fr. Aug–Sep.

Mixed forests in mountain regions, rocky slopes; 2300--3000 m. W Sichuan, NE Yunnan (Yongshan Xian).