Acacia quadrisulcata F.Muell.

Spreading much-branched shrub 0.4–1 m high. Branchlets with minute, straight or antrorsely curved hairs, glabrescent. Stipules scarious, triangular, c. 1 mm long. Phyllodes ± patent, quadrangular in section, 7–20 mm long, c. 1 mm wide, pungent, rigid, green, glabrous or subglabrous, 4-veined, sulcate between the veins; pulvinus dilated at base. Inflorescences simple, mostly 1 per axil; peduncles 5–10 mm long, glabrous; heads globular, 15–20-flowered, ?light golden (filaments orange-brown when dry). Flowers 5-merous; sepals free; petals 1-veined, sparingly and obscurely penniveined. Pods linear, subterete, to 5 cm long, 4 mm wide, ± woody, glabrous; margins broad, yellow. Seeds longitudinal, ovate to oblong, c. 3 mm long, turgid, mottled; aril oblique.

Grows in deep sand, sometimes over limestone, in heath or shrubland.