羽叶长柄山蚂蝗 yu ye chang bing shan ma huang

Desmodium oldhamii Oliver, J. Linn. Soc., Bot. 9: 165. 1865 ["oldhami"]; Podocarpium oldhamii (Oliver) Y. C. Yang & P. H. Huang.

Herbs, perennial, 50-150 cm tall. Stems glabrescent. Leaves 5-7-foliolate; petiole ca. 6 cm, pubescent; leaflet blade lanceolate, oblong, or ovate-elliptic, 6-15 × 3-5 cm, both sur­faces sparsely pubescent, base cuneate or obtuse, apex acumi­nate. Racemes simple or shortly branched at lowermost part, to 40 cm, uncinate pubescent and yellow pubescent, laxly flow­ered. Pedicel 4-6 mm, elongated to 6-11 mm at fruiting. Calyx 2.5-3 mm; upper lobes distinctly 2-toothed at apex. Corolla purplish red, ca. 7 mm; standard broadly elliptic; wings and keel narrowly elliptic, base shortly clawed. Stamens monadel­phous. Ovary linear, stipitate. Legume flat, uncinate pubescent, mostly 2-jointed, rarely 1- or 3-jointed; articles obliquely triangular, 1-1.5 cm × 5-7 mm. Seeds ca. 9 × 5 mm. Fl. Aug-Sep, fr. Sep-Oct. 2n = 22.

Forests on mountain slopes, streamsides, thickets, rocky places; 100-1700 m. Anhui, Fujian, ?Guangdong, Guizhou, Hebei, Heilong­jiang, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Sichuan, Zhejiang [Japan, Korea, Russia (Far East)].

The whole plant is used medicinally for diuresis. It also is used as a pesticide.