Acacia hystrix

Acacia hystrix is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is a rounded or inverted cone-shaped shrub with erect, sharply pointed phyllodes sometimes continuous with the branchlets, spherical heads of bright, light golden yellow flowers and oblong to narrowly oblong pods.

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Acacia hystrix is a more or less dense, rounded or inverted cone-shaped shrub that typically grows to a height of 0.3–1.0 m (1 ft 0 in – 3 ft 3 in) and has glabrous branchlets. The phyllodes are sharply pointed, rigid, sometimes continuous with the branchlets but without forming wings, pentagonal in cross section, 20–60 mm (0.79–2.36 in) long and 1.0–1.7 mm (0.039–0.067 in) wide. The phyllodes are glabrous, more or less glaucous between five prominent yellow or yellow-green polished surfaces. There are inconspicuous stipules at the base of the phyllodes, but usually fall off. The flowers or borne in two spherical heads in axils on a peduncle 5–15 mm (0.20–0.59 in) long, each head with 10 to 13 bright, light golden yellow flowers. Flowering period depends on subspecies, and the pods are oblong to narrowly oblong, up to 25 mm (0.98 in) long and 3–5 mm (0.12–0.20 in) wide, firmly papery to thinly leathery, curved downwards and glabrous. The seeds are oblong, 2.2–2.7 mm (0.087–0.106 in) long, somewhat glossy brown, with an aril from one half to the full length of the seed.