Japan Flora: Slender twining annual; stems elongate, retrorsely short-pilose while young; stipules small, 2-3 mm. long, the stipels acuminate, the terminal leaflets ovate, some­times lanceolate, 2-5 cm. long, loosely appressed-pilose; ra­cemes 2- to 5-flowered, long-peduncled, the bracteoles lanceo* late, 1-nerved, acute, slighdy shorter than the calyx-tube; flowers about 10 mm. across; legumes linear, 3-4 cm. long, smooth, the seeds ellipsoidal, dark brown. July-Sept. 

Kyushu; rare. Korea and Manchuria.