Acacia extensa, commonly known as wiry wattle, is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia. It is a spindly, open shrub with angled, sometimes narrowly winged branchlets, few, often thread-like phyllodes resembling the branchlets, spherical heads of light golden yellow flowers and linear pods somewhat resembling a string of beads.

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