Vines, woody, twining, densely villous. Stems longitudinally ribbed. Leaves pinnately 3-foliolate; stipules lanceolate, 2-3 mm, deciduous; petiole 1-2.5(-5) cm; petiolules extremely short; leaflets papery to thickly papery, both surfaces pubescent, denser abaxially and with rosinlike glands; terminal leaflet obovate-rhomboid, 4-7 × 2-4.5 cm, base rounded to obcuneate, apex acuminate; basal veins 3; lateral leaflets slightly smaller, obliquely ovate, 4-7 × 2-4.5 cm. Raceme axillary, robust, 3.5-6 cm; bracts large, ovate, to 1.7 cm, membranous, exterior with several longitudinal striae and rosinlike glands, clothed with micro-villous hairs, deciduous; pedicels 3-7 mm, hairy. Calyx campanulate, 5-lobed; lobes lanceolate, unequal, upper 2 nearly connate, sparsely pubescent. Corolla yellow, ca. 1.5 cm, persistent; standard obovate-circular, with inflexed auricles on each side; wings oblong, slightly shorter than standard; keels subequal to wings, with auricles, apex curved. Ovary densely pubescent; style filiform, apex curved. Legume oblong, inflated, 4-7 × 0.8-1 cm, hairy, transversely constricted between seeds. Seeds 8-10, ellipsoidal to oblong, ca. 3 mm in diam.; strophiole thick and succulent. Fl. Sep-Nov, fr. Nov.
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