Acacia cretacea, also known as chalky wattle, is a species of flowering plant in the family Fabaceae and is endemic to South Australia. It is a spindly, straggy shrub or tree, with rather crowded, narrowly lance-shaped to narrowly elliptic, leathery phyllodes, spherical heads of lemon yellow to golden yellow flowers and firmly papery to thinly leathery, linear pods.

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