Shrub or tree 2-4 m high, somewhat gnarled. Branchlets glabrous. Phyllodes vertically deflexed, straight, terete, 9-22 cm long, 1-1.5 mm diam., long-tapering acuminate, pungent, rigid, glabrous, with ±16 closely parallel, ±raised nerves. Inflorescences simple, 2 per axil; peduncles 3-6 mm long, glabrous; spikes 7-10 mm long, 4-5 mm diam., densely flowered. Flowers 4-merous; sepals free. Pods linear, strongly raised over and ±constricted between seeds, slightly curved, to 16.5 cm long, 7.5-8 mm wide, thin-crustaceous, irregularly longitudinally striate, glabrous. Seeds longitudinal, broadly elliptic, 6.5-7.5 mm long, dull, dark brown to black; aril minute.
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A small tree 2-3 m high. The bark is black. The leaves (phyllodes) are like needle up to 10 cm long and they point downwards. The flower heads are rods about 1 cm long. They are yellow. They occur on short stems. The pods are flat and slightly curved. They are 8-20 cm long and constricted between the seeds.
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