A. microcarpa var. linearis Black was described from material from near Monarto South and has been considered conspecific with A. x grayana Willis which was based on material from western Victoria. However it was suggested by Leach & Whiffin (1978) that all of these are hybrids (or intermediates) of A. calamifolia and A. brachybotrya. Further work is needed to clarify the status of these various taxa.

The species A. microcarpa and its allies are discussed by Maslin (1987) where a map of its distribution is also given. Confusion with A. triquetra and A. acinacea has occurred.