Small tree. Leaves 2-foliolate, subsessile; leaflets broadly oblanceolate, 3-3.5 dm. long, sometimes 1 dm. broad, chartaceous, basally oblique, apically acute or acuminate. Inflorescence lateral, borne on older branches, 3-5 cm. long, short-pedunculate. Flowers pedicellate, the pedicels 4-6 mm. long, glabrous; sheath (fused bracteoles) 9-11 mm. long, glabrous, cleft for half its length; calyx gla-brous, the lobes imbricate in bud, linear-oblong to linear-obovate and about 2 cm. long in anthesis; petal 1, elliptic, about 4 cm. long and 13 mm. wide, thin, erose-undulate margined, glabrous, short-clawed; ovary lightly pubescent on margins, the style glabrous; legume oblong, 15 cm. long and 5 cm. wide, glabrous, the valves twisting in age; seed oblong, 2 cm. long, flattened, rugose.
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