Perennial, multistemmed and branched from ground level to form an erect rounded shrub to 4 m, or a more slender treelet up to 7 m. Stems when young faintly longitudiÂnally ridged, appressed-pubescent with short white hairs, becoming woody, terete and covered in greyish-brown, longitudinally striated bark with age. Leaves: petiole and rhachis 5,5-20 cm long: stipules asymmetric, linear to falcate, ± 1 cm long, ± 0,1 cm wide, appressed-pubescent, caducous; petiole 4-8 cm long including basal pulvinus, petiolar gland lacking; rhachis faintly channelled to ± flattened adaxially with 1 shortly-stalked conical gland between each pair of leaflets except usually the two uppermost; leaflets in (2-)4-6(-9) pairs, ovate or elliptic (2-)4-7 cm long, (l,3-)2-3,2 cm wide, uppermost 1 or 2 pairs largest, petiolules ± 3 mm long, appressed white-pubescent, bases slightly asymmetric, broadly cuneate to ± rounded, apices obtuse, margins slightly thickened, glabrous, surfaces glabrous, adaxial green, abaxial markedly glaucous. Inflorescences axillary racemes crowded to the ends of branches, peduncles 3-8 cm long, pedicels, appressed-pubescent, at flowering 2-2,5 cm long with a single conical, eventually deciduous, gland at the base of each adaxially; bracts ovate or elliptic, 4-5 mm long, appressed pubescent abaxially. Sepals obtuse. Petals 2-2,5 cm long, 0,7-1 cm wide, shortly stalked, greenish yellow. Stamens 10, fertile, ± uniform, filaÂments 1-2 mm long, dehiscence porose. Ovaries densely sericeous along abaxial suture, otherwise sparsely sericeous to glabrous, curved; style glabrous; stigma hollow with ± membranous margin. Pods flattened, straight, 12-15 cm long, 1-1,5 cm wide, transversely septate, apex often beaked, valves ± membranous, glabrous, brown, sutures hardly thickened. Seeds laterally compressed, ± oblong, ± 7 mm long, ± 3 mm wide; testa shining, brown, smooth, lacking an areole.
