13. Desmodium oblongum Wallich ex Bentham in Miquel, Pl. Jungh. 224. 1852.
长圆叶山蚂蝗 chang yuan ye shan ma huang
Shrubs, erect, 70-150 cm tall, much branched, sparsely hooked hairy. Leaves 1-foliolate; petiole 1-1.4 cm, with dense, minute, hooked and straight, adpressed hairs; blade oblong or oblong-lanceolate, 7-12 × 2.5-4.5 cm, abaxially densely adpressed pubescent, veins sparsely minutely hooked hairy, adaxially glabrous except for hairy veins. Panicles terminal or axillary, 10-30 cm, laxly flowered, 2-flowered at each node. Pedicel ca. 1.2 cm, elongated to 1.7 cm at fruiting. Calyx ca. 3 mm; lobes ca. as long as tube. Corolla purple or violet, 8-10 mm; standard nearly orbicular to broadly obovate, shortly clawed; wings obliquely oblong, auriculate, shortly clawed; keel clawed. Stamens monadelphous. Ovary adpressed pubescent, 6-9-ovuled. Legume narrowly oblong, 1.5-3 × ca. 0.3 cm, lower suture crenate, upper suture deeply constricted, subglabrous, glabrescent, 5-7-jointed. Fl. and fr. Aug-Nov.
Broad-leaved forests or thickets; 1000-1900 m. Guangxi, Yunnan [Bhutan, Cambodia, India, Laos, Myanmar, Thailand, Vietnam].