Considerations on the mobility of residual elements in supergene environment are made under biogeochemical point of view to aim a better understanding of a minor and trace elements on biosphere. The results show that even elements less mobile like Al, Ti, and Zr are absorbed by Baccharis undneUa DC. in appreciable quantities. Even more, this species reveal a capacity to concentrate Al which gives to it a charater of accumulator and tolerant to an excessive content of aluminium.
