This is a list of Acacia species (sensu lato) that are used for the production of tannins. + Tannin Content of Various Acacia Species Bark Dried LeavesSeed PodsSpecies Tannins [%] Tannins [%] Tannins [%]Acacia albida   2-28% 5-13%Acacia cavenia 32%Google Books Select Extra-tropical Plants Readily Eligible for Industrial Culture Or Naturalization By Ferdinand von Mueller  Acacia dealbata 19.1%Plants for a Future Database   Acacia decurrens 37-40%   Acacia farnesiana 23%Plants for a Future Database  Acacia mearnsii 25-35%   Acacia melanoxylon 20%   Acacia nilotica 18-23%*  Acacia penninervis18%   Acacia pycnantha 30-45%   15-16%  Acacia saligna 21.5%Plants for a Future Database     Notes: * - Inner bark

References