voluble, herbaceous; stem and petioles retrorsely villoso-pubescent; leaflets ovate or ovato-lanceolate, hispidulous; stipules minute, eared at base, ovate; peduncles very long, racemose toward the extremity, several-flowered, the rachis spirally twisted; calyx campanulate, 4-fid, its segments ovate, acute, shorter than the tube; carina falcate, acute; legume compressed, straightish, hook-pointed, subtorulose, pubescent. Stem long, climbing, with scanty, reversed, and very soft pubescence. Petioles 2–5 inches long. Stipules and stipellæ minute. Leaflets mostly ovato-lanceolate, but varying much in size, the larger 4–5 inches long, the smaller 1–1 1/2 inch, all pale green. Peduncles 5–10 inches long, closely many-flowered within an inch of the summit. Fl. greenish-yellow, 6–7 lines long. Pods 2–3 inches long, 2–3 lines wide, irregularly constricted. The two uppermost calyx-lobes are completely connate into one very broad one, which is shorter than the rest.
