Acacia costiniana, commonly known as Costin's wattle, is a species of flowering plant in the family Fabaceae and is endemic to New South Wales, Australia. It is a weeping, multi-stemmed shrub with crowded, mostly ascending to erect, egg-shaped to elliptic phyllodes, oblong to more or less spherical heads of golden or rich lemon yellow flowers and thinly leathery, narrowly oblong pods.

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