44. Spiraea papillosa Rehder in Sargent, Pl. Wilson. 1: 443. 1913.
乳突绣线菊 ru tu xiu xian ju
Shrubs 2–3 m tall. Branchlets brownish to purple-brown, slender, slightly angled, glabrous, puberulous, or pubescent; buds brownish, ovoid, small, with several scales, pubescent, apex obtuse or acute. Petiole 2–3 mm, sericeous-villous; leaf blade gray-green abaxially, dark green adaxially, oblong or ovate, 2–4 × 0.8–1.5 cm, appressed sericeous-villous on both sufaces, papillose abaxially, base cuneate, margin with 3–7 large, sharp teeth on each side above middle, apex acute or shortly acuminate. Racemes umbellate, 3–5 × 2–3.5 cm, 12–20-flowered; pedicels slender, 6–12 mm, glabrous or pubescent; bracts linear or lanceolate, 3–5 mm, slightly villous. Flowers 8–10 mm in diam. Hypanthium campanulate, glabrous abaxially. Sepals triangular, 1.5–2 × 2–3 mm, reflexed in fruit, apex acute or shortly acuminate. Petals white, suborbicular, 3.5–4.5 mm in diam., glabrous, base shortly clawed, apex obtuse. Stamens 40–50, longer than petals. Disk annular, crenulate. Styles ca. 4 mm, shorter than stamens. Follicles suberect, glabrous or puberulous along adaxial suture; styles terminal. Fl. May–Jun, fr. Jul–Aug.
Coniferous and broad-leaved mixed forests, thickets on slopes; 1300--3500 m. W Sichuan, NW Yunnan.