Tree 8–30 m high, canopy grey green. Bark shallowly rimose, grey. Branchlets flattened and angled at extremities, glabrous. Phyllodes dimidiate to subfalcate, 5–15.5 cm long, (1–) 1.5–2.5 (–3.5) cm wide, thinly coriaceous, ±dark green to grey green with a slight sheen, glabrous; longitudinal veins numerous (4 or 5 per mm), parallel and not anastomosing, with 3 or 4 main veins slightly raised (when dry), broader and more prominent than the rest; 3 or 4 less prominent secondary veins also present; minor veins not or scarcely raised; main veins commonly confluent with lower margin for a short distance above pulvinus; pulvinus 3–6 mm long. Inflorescences simple, 4–8 per axil; peduncles 4–6 mm long; spikes 3–6 cm long, pale lemon yellow. Flowers 5-merous; calyx gamosepalous, c. 0.5 mm long, dissected for ¼ its length, glabrous; ovary glabrous. Pods oblong to narrowly oblong, undulate (especially the dorsal margin), moderately to strongly curved (sometimes into an open circle), 2–5 cm long, (1–) 1.5–2 cm wide, woody, glabrous, dehiscing along dorsal suture, with ±longitudinal, raised and anastomosing veins. Seeds oblique to transverse, ±ovate, 3–6 mm long, brown to black; aril greyish cream.
Details of utilisation, etc. of Acacia celsa are given by D.J. Boland et al., Forest Trees of Australia 5th edn, 142 (2006) and M.W. McDonald & B.R. Maslin, Australian Systematic Botany 13(1): 37 (2000).
Can be grown by seedlings. Seeds needs soaking.