Spiraea trilobata L.

Shrubs 1–2 m tall. Branchlets spreading, tortuous, yellow-brown or purple-brown, turning dark gray-brown, slender, glabrous; buds broadly ovoid, small, with several scales, glabrous, apex obtuse. Petiole 3–5 mm, glabrous; leaf blade suborbicular, 1.7–3 × 1.5–3 cm, glabrous or abaxially sparsely pubescent, conspicuously 3–5-veined, base subcordate or rounded, rarely cuneate, margin slightly crenate above middle, usually 3-lobed, apex obtuse. Umbels pedunculate, 2–4(–5) cm, 15–30-flowered; pedicels 8–13 mm, glabrous or sparsely pubescent; bracts oblanceolate or linear, 4–7 mm, deeply divided into slender lobes. Flowers 6–8 mm in diam. Hypanthium campanulate, glabrous or sparsely pubescent abaxially. Sepals triangular, 1.5–2 mm, erect in fruit, apex acute. Petals white, broadly obovate, 2.5–4 mm in diam., apex emarginate. Stamens 18–20, shorter than petals. Disk annular, 10-lobed; lobes unequal, apex emarginate. Carpels pubescent; styles shorter than stamens. Follicles spreading, glabrous or puberulous only on adaxial suture; styles slightly divergent. Fl. May–Jun, fr. Jul–Aug.

Anhui, Gansu, Hebei, Heilongjiang, Henan, Jiangsu, Liaoning, Nei Mongol, Shaanxi, Shandong, Shanxi, Xinjiang [Korea, Russia].

Thickets, open rocky slopes, montane regions; 400--2400 m.

Spiraea trilobata, known as Asian meadowsweet, is a species of flowering plant in the family Rosaceae. It was first formally named in 1771. Spiraea trilobata is native to Asia. It has occasionally naturalized in the United States.

Spiraea trilobata là loài thực vật có hoa trong họ Hoa hồng. Loài này được L. miêu tả khoa học đầu tiên năm 1771.

三裂绣线菊（学名：Spiraea trilobata）为蔷薇科绣线菊属下的一个种。