Appears very closely allied to <I>Acacia sessiliceps</I> F. Muell. from which it differs mainly in broader phyllodes. The variation and gradation to the narrow phyllode forms, similar sessile flower-heads and legume characters makes these two species difficult to distinguish. See also L. Pedley (1978). Further investigation into these two species is required to ascertain whether <I>Acacia sessiliceps</I> can be satisfactorily distinguished from <I>A. oswaldii</I>.