Spindly open shrub or tree to 5 m high; branches sometimes pendulous. Branchlets slender, with scattered lenticels, dark red-brown, glabrous. Phyllodes filiform, terete to quadrangular, 12–24 cm long, 0.5–0.8 mm wide, acute, not rigid, longitudinally sulcate when dry, puncticulate, glabrous; veins not evident; gland obscure, 3–15 mm above pulvinus; pulvinus prominent, 1–2 mm long. Inflorescences simple; peduncles 2–6 per axil, 6–13 mm long, slender, glabrous; basal bract persistent; heads globular, c. 35-flowered, yellow; bracteoles exserted in buds. Flowers mostly 5-merous; sepals free, linear-spathulate. Pods linear, prominently raised over seeds alternately on each side, to 15 cm long, 3.5–5 mm wide, very thinly coriaceous, glabrous. Seeds longitudinal, oblong to elliptic, 4–5.5 mm long, 2–2.5 mm wide, turgid, ridged at periphery, dull, mid-brown, dark coloured bordering pleurogram; funicle filiform, scarcely arillate.
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