Description from Flora of China
Hedysarum obcordatum Poiret in Lamarck, Encycl. 6: 425. 1805; Lourea obcordata (Poiret) Desvaux.
Herbs, perennial, prostrate, 15-60 cm. Leaves often 3-foliolate, rarely 1-foliolate; petiole 8-10 mm, filiform, gray pilose; terminal leaflet blade mostly reniform, orbicular-triangular, or obovate, 0.5-1.5 × 1-2 cm, abaxially pilose, adaxially glabrous, base broadly cuneate, apex truncate and slightly emarginate; lateral ones obovate, cordate, or nearly orbicular, 6-7 × ca. 5 mm, lateral veins 3-5 on each side of midvein. Racemes mostly terminal, 3-18 cm, 1-flowered at each node. Pedicel 2-3 mm. Calyx half-hyaline, initially ca. 2 mm, to 6-8 mm at fruiting, distinctly reticulate veined; lobes ca. as long as tube. Corolla bluish purple or roseate, 3-5 mm, slightly longer than calyx. Legume 4- or 5-jointed, wholly enclosed by calyx; articles orbicular, ca. 2.5 mm in diam., glabrous. Fl. May-Aug, fr. Sep-Oct.
Open grasslands, waste slopes, thickets; below 500 m. Fujian, Guangdong, Guangxi, Hainan, S Taiwan [Cambodia, India, Indonesia, Japan, Laos, Malaysia, Myanmar, New Guinea, Philippines, Thailand, Vietnam; N Australia].