Small to fairly large tree; twigs ribbed or rounded, moderately clothed in erect hairs. Lvs 2-pinnate, alternate, ± glabrous except for sparse short erect hairs on rachis; pinnae in 3-5 pairs; pinnules in 11-22 pairs, close set, glaucous, oblong, acute, entire, 4-6 × c. 1 mm; petioles 1-3 mm long; stipules inconspicuous; solitary glands present between each pair of pinnae except at base. Infl. of numerous, many-flowered, medium yellow, globose heads arranged in axillary racemes exceeding the lvs. Fls 5-merous, sessile. Pod glabrous, ± straight, 40-100 × (8)-10-20 mm; aril not folded, thickened below and to one side of seed.