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This article comments on various issues related to biogeography. Several factors likely contribute to the lack of understanding of the biogeography of plant chemistry. Among these important factors are climate, geomorphology, vegetation type and site history. There has been an increase or renewal of interest in the biogeography and the stoichiometry of ecological chemistry. The Rhizosphere 2004 Congress held in Munich, Germany, was organized to mark the centenary of the publication of a paper by Lorenz Hiltner in which he introduced the term rhizosphere that was defined as the soil compartment influenced by the root.