圆叶野扁豆 yuan ye ye bian dou

Indigofera rotundifolia Loureiro, Fl. Cochinch. 2: 458. 1790; Atylosia punctata (Wight & Arnott) Dalzell; Dolichos punctatus Wight & Arnott; Dunbaria punctata (Wight & Ar­nott) Bentham.

Herbs, perennial. Stems twining, slender, sparsely pubes­cent. Leaves pinnately 3-foliolate; stipules small, deciduous; petiole 0.8-2.5 cm, densely pubescent; petiolules 1-2 mm, densely pubescent; leaflets papery; terminal leaflet orbicular-rhomboid, 1.5-2.7(-4) cm, slightly wider than long, sparsely pubescent or almost glabrous, with dark brown glands, basal veins 3, base rounded, margin sinuate, apex obtuse; lateral leaf­lets smaller, oblique. Inflorescence 1- or 2-flowered; bracts nar­rowly ovate, 1-2 mm. Calyx campanulate, 2-5 mm, pubescent, with dense red to dark brown glands; lobes ovate-lanceolate, shorter than tube. Corolla yellow, 1-1.5 cm; standard obovate-orbicular, base with 2 auricles, apex slightly emarginate; wings obovate-oblong, slightly curved, mucronate; keels falcate, apex obtusely beaked. Ovary sessile. Legume linear-oblong, 3-5 × ca. 0.8 cm, slightly curved, compressed, pubescent or almost glabrous, apex with needlelike beak, stipe absent. Seeds 6-8, dark brown, suborbicular, ca. 3 mm in diam. Fl. Sep-Oct, fr. Oct-Nov. 2n = 22.

Slopes, grasslands; ca. 600 m. Fujian, Guangdong, Guangxi, Gui­zhou, Hainan, Jiangsu, Jiangxi, Sichuan, Taiwan [Bangladesh, Cam­bodia, India, Indonesia, Laos, Myanmar, Nepal, Philippines, Thailand, Vietnam; Australia].