Yep, 100% correct, even Australian Aborigines have known of and used herb type medicinal plants for thousands of years.
We have a special plant out here that we call " Belly Ache bush," crush up the leaves, rub it onto your belly and the aches/cramps. etc, of constipation, period pains and even hunger pains quickly lessen and disappear as does it also reduce the pains during a woman giving birth as well.
It can also be used in the same way to treat a headache and to lessen the results of burns or scalds from fire or boiling water.
But NEVER eat it or swallow the juice of it because it works very much like an emetic, a very fast acting and very harsh emetic.
Oh, and we also have one we call 'Crazy weed,' drop a few leaves into a billabong or slow moving water and the fish, etc, rise to the surface and try to swim around in small circles, hang a small sprig of in a tree and 'roos and Emus will come up, eat it and just stand around in a kind of daze.
Sheep and Cattle Graziers hate it and do their utmost to destroy it at every opportunity since it makes the stock behave like they are drunk and crazy, running around in circles or just standing around in a spaced out daze.
Quite a funny sight to watch though I might add.