Tree to 15 m high; juvenile bipinnate leaves persistent until plant is at least 2 m high. Branchlets angled at extremities, dark reddish, glabrous. Phyllodes variable, linear to narrowly elliptic, 5.5–14.5 cm long, 2–14 mm wide, broad on young plants, narrow and similar to A. angusta on mature plants, thin, glabrous, 1-veined; lateral veins few and indistinct; gland pustular, 15–55 mm above pulvinus, often connected to midrib by a fine oblique vein, rarely a second gland some distance above the other. Inflorescences racemose; raceme axes 1–9 cm long, glabrous; heads globular, 18–25-flowered, golden; peduncles 3–5 mm long, glabrous. Flowers 5-merous; sepals united; ovary glabrous. Pods slightly raised over seeds, to c. 12 cm long, 5–7 mm wide, thinly coriaceous, mid-brown, glabrous. Seeds longitudinal, oblong to elliptic, 5–6 mm long, slightly shiny, black; aril clavate.
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