Scrambling annual, sparsely pubescent. Stem winged. Leaf pinnately compound, leaflets 2, 3.0-6.0 cm long, 3-11 mm broad, linear or oblong; stipules 10-18 mm long, linear, semisagittate, rachis ending in 3-sect or pinnately branched tendrils. Raceme 1-3-flowered, peduncle much longer than leaf. Calyx 4.5-5.5 mm long, teeth subequal, as long as or slightly longer than the tube. Corolla red or bluish purple, 10-14 mm long. Fruit 2-5 cm long, 5-8 mm broad, oblong-linear, pubescent, tuberculate, 5-10-seeded.