细叶蚊子草 xi ye wen zi cao

Spiraea angustiloba Turczaninow in Fischer & C. A. Meyer, Index Sem. Hort. Petrop. 8: 72. 1842; Filipendula angustiloba var. glabra Maximowicz.

Plants 50–120 cm tall. Stems sulcate, glabrous. Stipules green, broadly semicordate, herbaceous, margin serrate; leaf blade pinnate, with 2–5 pairs of leaflets, both surfaces green and glabrous; terminal leaflet usually 7–9-lobed, slightly larger than lateral ones, lobes lanceolate, margin sharply irregularly serrate, apex acuminate; lateral leaflets resembling terminal one but less lobed. Inflorescence terminal, paniculate. Flowers bisexual, ca. 5 mm in diam.; pedicel glabrescent or sparsely pilose. Sepals ovate, apex obtuse. Petals white, obovate. Achenes erect, sessile, glabrous or hairy along ridge. Fl. and fr. Jun–Aug.

Damp places in forests, meadows, river banks; 600--1300 m. Heilongjiang, Nei Mongol [Mongolia, E Russia].