Mimosa tenuiflora is an entheogen known as Jurema, Jurema Preta, Black Jurema, and Vinho de Jurema. Dried Mexican Mimosa tenuiflora root bark has been recently shown to have a DMT (Dimethyltryptamine) content of about 1%.[3] The stem bark has about 0.03% DMT.
From wiki ^
It appears so, you can but it seems like alot more would be needed, 33x less potent

. However it would be interesting to see what other alkaloids may be present in the bark not present in the root bark. That a very common trait in alkaloid bearing plants. If you have access to bark for free i say go for it.