Acacia castanostegia

Acacia castanostegia is a species of flowering plant in the family Fabaceae and is endemic to an area in the southwest of Western Australia. It is a dense, rounded, glabrous and prickly shrub with many branches, linear phyllodes, spherical heads of cream-coloured flowers, and linear to flattened, thinly leathery to thinly crust-like pods.

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Acacia castanostegia is a dense, spreading, glabrous and prickly shrub that typically grows up to 50 cm (20 in) high, 60 cm (24 in) wide, has many branches and light grey bark. The branchlets are terete and have yellow ribs alternating with brown to light green and covered with a white loose surface. The phyllodes are linear, 11–29 mm (0.43–1.14 in) long, 1.0–1.5 mm (0.039–0.059 in) wide, straight or sometimes curved, rigid and sharply pointed. The flowers are arranged in a spherical head in axils, on a peduncle 3–4.5 mm (0.12–0.18 in) long. There are conspicuous, overlapping brown bracts at the base of the heads. Each head has 6 to 8 cream-coloured flowers. Flowering occurs from June to October, and the pods are linear, round to flattened in cross section, thinly leathery to thinly crusty, dark grey-brown 30–80 mm (1.2–3.1 in) long and 3.0–3.5 mm (0.12–0.14 in) wide with oblong, dark brown seeds 3.0–3.5 mm (0.12–0.14 in) wide with a creamy white, club-shaped aril. This wattle species is closely related to Acacia pachypoda.