Shrub or small tree, 1.5–7 m high. Bark splitting longitudinally or fibrous, grey to black. Branchlets angular or flattened, soon becoming terete, pale yellow or light brown, glabrous. Phyllodes linear, flat, 11–24.5 (–27) cm long, 4–10 mm wide, tapered toward apex and base, with apex drawn out into an elongate slender blunt tip, coriaceous, with subprominent midvein and 8–11 minor non-anastomosing veins per mm; gland 1, very inconspicuous, basal, 1–3 mm above pulvinus. Spikes single or paired on axillary shoots that sometimes become leafy, 2–5 cm long, densely flowered, yellow. Flowers 5-merous; calyx 1–1.25 mm long, dissected to 1/10–⅕, basally, villous, with orange-brown scurf on lobes; corolla 1.3–1.6 mm long, dissected to ⅓–½, glabrous; ovary densely villous. Pods linear, slightly constricted between and strongly raised over seeds, 5.5–11 cm long, 2–3 mm wide, with margins nerve-like, coriaceous, dark brown, glabrous. Seeds longitudinal, narrowly oblong to broadly elliptic, dorsiventrally flattened, 3–4 mm long, dark brown; areole small, surrounded by pale U-shaped pleurogram; funicle folded and thickened into cupular aril.
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A small tree. It often has several stems. It grows 3-6 m high. The bark is grey-black in colour. The leaves or phyllodes are yellowish-green and rigid. They are flattened and leathery. They are 12-22 cm long by 4-9 mm wide. The flowering head is a spike which is a cylinder shape. It is 2-4 cm long and does not have a stalk. The pod is narrow and 12-22 cm long by 4-9 mm wide. It is slightly raised over the seeds. The seeds occur longways in the pod. They are 3-5 mm long by 1-2 mm wide. They are shiny and dark brown or black.
Details of the utilisation of Acacia ammobia are given in J.W. Turnbull (ed.), Multipurpose Australian Trees and Shrubs 94–95 (1986) and J.C. Doran et al., in J.C. Doran & J.W. Turnbull (eds), Australian Trees and Shrubs: Species for Land Rehabilitation and Farm Planting in the Tropics 104–105 (1997).
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