Source of Tannin from black wattle

Black wattle (Acacia mearnsii) belongs to the Leguminosae family, Mimosoideae subfamily. It is native to Australia and cultivated mainly in South Africa, Brazil and China, at altitudes ranging from 850 m up to the sea level in temperate and subtropical climate, with mean temperature in the coldest month between 0 and 5 °C. It can endure several frosts per year and absolute minimum temperatures of (-11 °C). It has the ability to fix nitrogen through symbiosis with bacteria of the genus Rhizobium