四川花楸 si chuan hua qiu

Sorbus vilmorinii C. K. Schneider var. setschwanensis C. K. Schneider, Bull. Herb. Boissier, sér. 2, 6: 318. 1906.

Shrubs 2–5 m tall. Branchlets brownish gray to blackish gray, terete, glabrous, with inconspicuous small lenticels; buds narrowly ovoid, 5–7 mm, apex acute or shortly acuminate; scales several, dark reddish brown, reddish brown pubescent. Leaves imparipinnate, together with rachis 5–13 cm; petiole 0.8–1.5(–2.5) cm; stipules ovate-lanceolate or lanceolate, 4–6 mm, membranous, margin entire or lobed; rachis adaxially sulcate, glabrous, slightly winged; leaflets 12–17 pairs, terminal ones smaller, at intervals of 4–6 mm, pale abaxially, dark green adaxially, narrowly oblong, 0.7–1.6 cm × 4–7 mm, both surfaces glabrous, base usually obliquely rounded, apex obtuse or acute. Compound corymbs terminal on lateral branchlets, 3.5–5 × 2.5–4 cm, 10–25- or more flowered; rachis and pedicels glabrous, with small oblong lenticels; bracts lanceolate or linear-lanceolate, 3–5 mm, margin entire or sometimes lobed. Pedicel 1–3 mm. Flowers 7–8 mm in diam. Hypanthium campanulate, abaxially glabrous. Sepals triangular, 1–2 mm, apex acute or ± obtuse. Petals white, oblong-ovate, 3–4 × 2.5–3 mm, adaxially puberulous or glabrous, base shortly clawed, apex obtuse. Stamens 20, shorter than petals. Styles 3–5, nearly as long as stamens, glabrous. Fruit white or slightly stained purplish, globose, 5–8 mm in diam., with persistent erect sepals. Fl. May–Jun, fr. Aug–Sep. 2n = 34*.

Stony slopes, mixed forests; 2300--3000 m. Guizhou, Sichuan.