Acacia brachycarpa is a shrub belonging to the genus Acacia and the subgenus Phyllodineae endemic to Queensland. The shrub has a mompact and much-branched habit that typically grows to a height of less than 2 m (6 ft 7 in). The sparsely to moderately hirsutellous branchlets have 1 mm (0.039 in) long stipules. The pungent, rigid, flat, linear to linear-triangular shaped phyllodes have a midrib on each face . The phyllodes have a length of 9 to 15 mm (0.35 to 0.59 in) and a width of around 1 mm (0.039 in). The simple inflorescences occur singly per axil. The small spherical flower-heads contain 8 to 18 bright lemon yellow flowers. The blackish glabrous seed pods that form after flowering have a length of 8 to 20 mm (0.31 to 0.79 in) and a width of 3 to 4 mm (0.12 to 0.16 in) and contain one