It grows up to 2 metres high and has phyllodes which measure 0.2 to 0.6 cm long and 1 to 2 mm wide. The phyllodes are straight, narrow-cuneate, slightly notched at the apex, and feature prominent midveins. Branchlets are terete, whitish and densely pubescent; as the branch grows it becomes glabrous and terminates in rigid spinose point. The bark is grey, white or occasionally greenish.
The golden-yellow flowerheads are peduncles, 5–15 cm long, that appear at phyllode axils. Flower parts are pentamerous, with the sepals fused into a synsepalous calyx. Flowers appear from August to October, followed by irregularly twisted, glaucous, brown seed pods which are 3 to 6 cm long and 3 to 6 mm wide.
The species is relatively uncommon and is found scattered at several sites in isolated clumps: Buronga, Wentworth and Pooncarie districts in far south-western New South Wales, Victoria, South Australia and Arumpo Station and Montarna Station in Western Australia. Arumpo Station in particular is home to a stunted sample, which is threantened by overgrazing by kangaroos.
- Kodela P.G. & G.J. Harden. "Acacia acanthoclada". PlantNET - New South Wales Flora Online. Royal Botanic Gardens & Domain Trust, Sydney Australia. Retrieved 21 March 2011.
- "Acacia acanthoclada". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 21 March 2011.
- "Harrow Wattle - profile". threatened species. Department of Environment and Conservation (NSW). Retrieved 21 March 2011.
- Australian National Botanic Gardens: Photo of Acacia acanthoclada
- "Acacia acanthoclada". FloraBase. Department of Environment and Conservation, Government of Western Australia.
- NSW National Parks and Wildlife Service: Acacia acanthoclada - endangered species listing
- "Acacia acanthoclada F. Muell.". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
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