Shrub or small tree up to 3 m high; twigs furrowed, moderately hairy. Lvs reduced to phyllodes, alternate; phyllodes glabrous or sparsely hairy, ovate, asymmetric, usually shortly mucronate, entire, (5)-10-18-(20) × 2-8 mm, with one prominent vein; stipules usually spinescent, 3-10 mm long, sometimes membranous, triangular, 1-2 mm long. Infl. of many-flowered, axillary, golden, globose heads; heads usually solitary, occasionally paired or in small clusters; peduncles c. 10-15 mm long. Fls 5-merous, sessile. Pod usually villous, straight or curved, 40-50-(60) × 3-4 mm; aril with 2-4 folds, thickened below seed.