Acacia collegialis

Acacia collegialis is a spreading shrub or tree that typically grows to a height of 2.5–6 m (8 ft 2 in – 19 ft 8 in) and has fibrous, dark gray, fissured bark. Its phyllodes are narrowly elliptic, 50–85 mm (2.0–3.3 in) long and 4–7 mm (0.16–0.28 in) wide with a prominent central vein. The flowers are borne in oblong to shortly cylindrical spikes on peduncles 2–6 mm (0.079–0.236 in) long, each spike 5–9 mm (0.20–0.35 in) long with golden yellow flowers. Flowering occurs from April to August and the pods are linear to narrowly oblong, thinly leathery to crust-like, 40–80 mm (1.6–3.1 in) long and 4–6 mm (0.16–0.24 in) wide. The seeds are mostly oblong, 4–6 mm (0.16–0.24 in) long with a creamy white aril.

Southern rock wattle occurs from Coolgardie to Karonie about 100 km (62 mi) east of Kalgoorlie and south to near Norseman, where it grows in shallow sandy clay-loam in open tall shrubland or low woodland, in the Coolgardie and Murchison bioregions of inland Western Australia.