In South Australia Acacia leiophylla was previously often confused with and not distinguished from A. pycnantha (see Maslin and Whibley 1977). The two species can be found growing together mainly in the southern coastal regions. Acacia gillii from Eyre Peninsula region (southern part) is allied to golden wattle but has much narrower phyllodes and a different habit. A. saligna is closely related and differs in the thinner raceme axis and peduncles and phyllode base not so prominently tapered.