Mulga species show a great deal of variation in morphological features, especially growth form, phyllode (leaf) shape, size and color, and pod morphology. This variation is evident both among different populations of the one taxon and between different taxa within the one population. People with field experience of Mulga commonly encounter mixed-populations containing few to many different morphotypes. Applying names to the morphotypes has in the past been extremely difficult and the primary goal is to provide names of the taxa and provides tools for their use.