There are many species of Acacia in Australia, and here are four of them native to the semi-arid region surrounding the opal fields at Lightning Ridge -- including one that's famous for smelling awful!

In the fourth episode of Bush Botany, Warwick Schofield takes us to the Gidgee Forest via several other species of wattle.

Clarification: In this video I mention that some species of Acacia have modified leaf stems or cladodes in place of normal leaves. The correct term is “phyllodes” from the Ancient Greek "phullodes", meaning “leaf-like”. A phyllode is a modified leaf stem, whereas a cladode is a modified stem. Ultimately their function is very similar, but the terminology differs.