Acacia decurrens, commonly known as black wattle, Sydney green wattle or early green wattle and other common names, is a species of flowering plant in the family Fabaceae and is endemic to New South Wales, Australia. It is a tall shrub to tree with bipinnate, dark green leaves, spherical heads of golden yellow flowers and thinly leathery pods.

Cultivated throughout Australia, Acacia decurrens has naturalised in other Australian states and introduced to many other countries.

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