In South Australia most closely related to <i>A. ligulata</i> from which it is not always readily separated, but <i>A. cupularis</i> has red-brown, smooth rather than yellow-brown ribbed branchlets; linear rather than linear-elliptic phyllodes; narrower, 1-4 mm, rather than wider, 4-14 mm, phyllodes with a rounded-obtuse apex with central mucro rather than acute to obtuse and uncinate apex, also shorter racemes, smaller heads, narrower legumes which are more brittle and less woody.