Large shrub or tree 5–25 m high. Bark furrowed, flaky, dark grey to black. Branchlets angular, stout, pale brownish grey, ±pubescent. Phyllodes obliquely very narrowly elliptic, tapered gradually towards apex and base, flat, ±falcate, 10–16 cm long, (12–) 14–30 mm wide, coriaceous, with scattered appressed hairs but becoming glabrous (young tips golden hairy), with 3 main conspicuous veins confluent and contiguous with lower margin near phyllode base; minor veins 3–5 per mm, longitudinal, occasionally anastomosing; gland 1, basal, to 2 mm above pulvinus. Spikes 3.5–5.5 cm long, creamy yellow. Flowers 5-merous; calyx dissected to ⅓ of length, densely pubescent; corolla 1.5–1.8 mm long, dissected to ½ of length, glabrous; ovary pubescent. Pods straight-sided, tightly spirally coiled, (4–) 5–6 (–7) mm wide, coriaceous, pruinose, glabrous. Seeds longitudinal, elliptic-oblong, 3.5–4.5 mm long, black; areole elliptic, open; funicle-aril ±encircling seed in double-loop, thickened, orange or yellow.
Fringing rainforest or as a constituent of rainforest regrowth areas; also found in open forest, particularly in swampy areas; growing best on lowlands and foothills but also extending to the somewhat hilly tablelands.
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Often in sandy soils over granite, in rainforest, open forest, swampy areas.
Information on the utilisation of Acacia cincinnata is provided in J.W. Turnbull (ed.), Multipurpose Australian Trees & Shrubs 122 (1986), L.A.J. Thomson, Acacia aulacocarpa, A. cincinnata, A. crassicarpa and A. wetarensis: an Annotated Bibliography 22–25 (1994) 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 124–125 (1997). The wood has been used for cabinetwork and turnery.
Can be grown by seedlings. Seeds needs soaking.
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