Perennial shrub, up to 2 m high; rootstock enlarged. Stems succulent, much branched. Leaves with lateral leaflets 25-47 x 20-45 mm; terminal leaflet 30-48 x 25-55 mm. Flowers: inflorescence erect, appearing with leaves; calyx broadly campanulate, obscurely 5-toothed, green with purple flush; standard tricoloured, red proximally grading to yellow distally with green tip; Sep.-Jan. Pods subligneous, aculeate; seeds brown.