17. Sorbus pteridophylla Handel-Mazzetti, Symb. Sin. 7: 470. 1933.
蕨叶花楸 jue ye hua qiu
Shrubs or small trees, 4–7 m tall. Branchlets brown or blackish brown, terete, sparsely lenticellate; buds compressed-ovoid, 4–6 mm, apex acute; scales several, dark brown, tomentulose when young, glabrescent. Leaves imparipinnate, together with rachis 6–13 cm; petiole 1–1.5 cm; stipules lanceolate to ovate, 4–6 mm, herbaceous, sharply incised-serrate, rarely subentire; rachis slender, shallowly sulcate, pubescent, glabrescent, narrowly winged; leaflet blades 9–14-paired, at intervals of 6–8 mm, pale abaxially, dark green adaxially, ovate-linear or linear-oblong, 1.5–3 cm × 6–8 mm, lateral veins ca. 10 pairs, abaxially pubescent along midvein, papillose, adaxially glabrous, base obliquely rounded, margin mostly entire, with 4–8 sharp teeth per side near apex, apex obtuse or acute. Compound corymbs 3–6 × 4–7 cm; rachis and pedicels pubescent, gradually glabrescent, sparsely minutely lenticellate. Pedicel 3–5 mm. Flowers 5–7 mm in diam. Hypanthium campanulate, puberulous when young, glabrate. Sepals broadly triangular, 1–2 mm, glabrous, apex obtuse or acute. Petals white, broadly ovate or elliptic-ovate, ca. 3 × 2.5–3 mm, glabrous, apex obtuse. Stamens 20, shorter than petals. Styles 3–5, nearly as long as stamens, pubescent basally. Fruit ovoid, 6–8 mm in diam.; sepals persistent. Fl. Jun, fr. Aug–Sep.
Dry slopes, mixed forests in mountain valleys, cliffs; 2700--3800 m. Xizang, Yunnan [N Myanmar].