The tanner acacia (acacia catechu).
Mimosa bark is a vegetable tannin, which is extracted from the tanner acacia cultivated in Australia, Southeast Asia and South Africa. The bark of the tree is used for tanning as it has a very high tannin content of up to 30 percent. Leather tanned with mimosa bark has a reddish colour through the tannins.
Mimosa extract is also used in natural medicine to treat headaches and diarrhoea.