Spiny shrubs. Lvs 3-foliolate, petiolate; leaflets entire; lateral veins indistinct; stipules inconspicuous. Fls axillary and solitary, or in fascicles or ebracteate racemes; bracteoles usually 3-fid. Calyx tubular, with 5 short teeth; upper portion soon breaking away leaving a cup-like remnant. Corolla yellow. Stamens connate into a closed tube; alternate anthers long and basifixed or short and versatile. Style incurved, glabrous; stigma capitate or oblique. Pod flattened, ± straight or slightly curved, dehiscent, with upper suture somewhat thickened and usually winged, several-seeded; seeds estrophiolate.
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