Small to large tree; twigs rounded to sharply angled, ± glabrous or with few to many, sparsely distributed, very fine, appressed hairs. Lvs 2-pinnate, alternate, glabrous or with fine appressed hairs on rachis only; pinnae in (4)-5-10-(12) pairs; pinnules in (15)-20-40 pairs, widely spaced, dark green, linear, obtuse to subacute, entire, (5)-7-12-(15) × c. 0.5 mm; petiole (10)-15-30 mm long; stipules inconspicuous; solitary glands present between each pair of pinnae, usually including 1 between or below basal pair. Infl. of numerous, many-flowered, deep golden yellow, globose heads arranged in axillary, simple or compound racemes ± = lvs. Fls 5-merous, sessile. Pod glabrous, ± straight, 40-100 × 4-8 mm; aril scarcely folded, thickened to one side of seed.