It is Acacia concurrens, but can be very easily confused with Acacia leiocalyx. They have falcate phyllodes, angular branchlets, flowers in spikes, colour varying from pale yellow to lemon. They are both are member of the 'A. cunninghamii group' and the differences between the two species are subtle. Actually they used to be A. cunninghamii , and I wish they would be left alone!!!

'Acacia cunninghamii group' includes 7 Acacias, thay are all have spicate inflorescences and large phyllodes, they closely interrelated and taxonomically 'difficult' species belonging to the often confused and poorly defined. You can read about the difference in the Wattle site.

Common names: Curracabah, Late Flowering Black Wattle, or just Black Wattle, which is even more confusing, as it shares its name with many other trees.