Careful experiment has shown that on removing the ants, those trees cease to thrive. This could be the result of predators moving in or the effects of crowding from surrounding trees. Acacias not normally inhabited regularly by ants usually have bitter-tasting chemicals in their tissues which probably have the same effect of deterring predators. Flowers Floral shoots are racemes, spikes or single heads. The individual flowers are usually small and clustered.
Bracteoles are small or absent.
Flower heads come from the upper angle between the leaf or phyllode and the branchlet i.e. they are axillary. Pair of single globose flower heads, each on a stem, each coming from a single common axillary shoot. Ball flower heads, solitary, from a phyllode axil Rod flower head and a phyllode with 3 veins or nerves Flowers are actinomorphic, ie. The calyx and corolla valvate, ie. But many are 4-merous.