Twining deciduous shrub, very large, tuberous roots; branches finely grey downy; stipules minute, deciduous, cordate-ovate; leaves 3-foliolste, leaflets stipellate, membranous, obscurely roundish, glabrescent above, densely clothed with whitish adppresed hairs beneath, lateral ones oblique; flowers in dense, virgate, leafless often panicled receme, reaching 12-20 cm in length; pedicels very short, densely fascicled; bracts very minute; calyx teeth long, densely silky; upper 2 connate; corolla blue or purple, nearly twice the calyx, distinctly exserted, standard orbicular, distinctly spurred, wings oblong, keel obtuse; stamens monadelphous, anthers uniform; ovary sessile or nearly so, many ovuled; style filiform, not bearded; stigma capitate; pods linear, about 4-8 cm long, membranous, flat, many seeded, clothed with long, grey, silky, bristly hairs.