Acacia blakelyi is a shrub or tree belonging to the genus Acacia and the subgenus Phyllodineae. The dense glabrous shrub or tree typically grows to a height of 1 to 3 metres (3 to 10 ft). The branchlets are flexuous with caducous stipules. The green phyllodes are horizontally flattened with a linear to very narrowly elliptic shape. Each phyllode is 7 to 15 centimetres (2.8 to 5.9 in) in length with a width of 2 to 15 millimetres (0.08 to 0.59 in) and are coarsely pungent. It blooms from July to September and produces yellow flowers. Inflorescences are made up of three to four globular heads each with a diameter of 7 to 8 mm (0.28 to 0.31 in) each composed of 20 to 30 golden flowers. Following flowering seed pods that are straight to shallowly curved up to about 16 cm (6.3 in) in length and