Acacia idiomorpha is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is a spreading, sprawling, spiny shrub with wavy, asymmetically egg-shaped to narrowly egg-shaped, elliptic to narrowly elliptic or narrowly oblong phyllodes, spherical to slightly oblong heads of golden yellow flowers and wavy, narrowly oblong, often curved pods.

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