Maslin (1975) considers <I>A. pulchella</I> most closely related to <I>A. lasiocarpa</I> and <I>A. megacephala</I> two species in W.Aust. In South Australia only likely to be confused with <I>A. mitchellii</I> (sp. 113) and <I>A. farnesiana</I> (sp. 110). From the first it is readily separated by its spine tipped branchlets and axillary spines and from <I>A. farnesiana</I> by its single pair of leaflets and flat rather than swollen pods.