Tree to 10 m high. Bark smooth, grey, with base later corrugated and blackish. Branchlets terete with 4–6 ridges c. 0.2 mm high, and with numerous lenticels, glabrous. Young foliage-tips blackish brown, almost glabrous. Leaves green; petiole 0.7–4.7 cm long, glabrous or with sparse minute white hairs, with a gland just below lowest pinnae to median; rachis 1.5–6 cm long, with 1 (rarely 2) gland(s) at base of pinnae; interjugary glands absent; pinnae 2–6 pairs, 3–7.8 cm long; pinnules 14–30 pairs, often arranged alternately except towards apex, linear, (2–) 4–9 (–13.5) mm long, 0.25–0.4 mm wide, with 1 central nerve, ± glabrous, acute. Inflorescences mainly in axillary or terminal false-panicles. Peduncles 1–4 mm long, glabrous. Heads 12–26-flowered, golden. Pods ±straight, mostly straight-sided to barely constricted between seeds, 3–8 cm long, 5–7 mm wide, subcoriaceous (young), light brown to black, glabrous.
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