The shrub typically grows to a height of 1 to 3 metres (3 to 10 ft) and has a spreading habit and glabrous branchlets with phyllodes that have an inequilaterally oblanceolate to narrowly elliptic shape.

The firmly chartaceous to thinly coriaceous seed pods have a narrowly oblong shape with a length of up to 6 cm (2.4 in) and a width of 7 to 8 mm (0.28 to 0.31 in).

The pods contain dull black seeds that are arranged longitudinally with an ovate shape and a length of 4 mm (0.16 in).

[1] The species was first formally described by the botanist Conrad Loddiges in 1819 as a part of the work The Botanical Cabinet.

It was reclassified as Racosperma lunatum by Leslie Pedley in 2003 then transferred back to genus Acacia in 2006.