Shrub to large tree; twigs ribbed or somewhat angled, tomentulose. Lvs 2-pinnate, alternate, tomentulose on rachis and undersurface of pinnules; pinnae in 9-18 pairs; pinnules in (20)-35-55-(60) pairs, close set, dark green, oblong, obtuse, entire, 1.5-3-(4) × c. 0.5 mm; petiole 15-25 mm long; stipules minute; solitary glands present between each pair of pinnae including basal pair, and 0-2 additional, often smaller, glands present in all lvs between the pairs of pinnae and often on petiole (sometimes glands irregularly distributed with respect to pinnae but always more than number of pinnae pairs). Infl. of numerous, many-flowered, pale creamy yellow, globose heads arranged in axillary, simple or compound racemes ± = lvs. Fls 5-merous, sessile. Pod puberulent, straight or somewhat curved, 30-90 × 4-7 mm; aril scarcely folded, thickened at base to one side of seed.