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For several decades botanists have been impressed by the discovery
that the distribution of secondary plant substances follows the
general lines of plant relationships. However, it soon became clear
that little was to be gained from the study of individual compounds
and their natural distribu tion. Therefore, more comprehensive
studies were attempt ed in which the secondary chemistry of a major
plant group was carefully studied and evaluated in the broader
context of comparative phytochemistry. Holger Erdtman's admir able
work on Coniferae is the foremost example of this kind. Since then,
there has been an upswing in the study of the biosynthesis of
secondary plant substances and it has become quite customary to
make use of biosynthetic knowledge in interpreting chemosystematic
evidence. More over, since taxonomists have insisted that use be
made of all potentially available evidence for building
classifications, it has been claimed that chemosystematics too
should con sider the whole array of constituents present in a major
taxon. However, in practice it has proved difficult to utilize
fully the potential of natural product chemistry and biosynthetic
studies for plant systematics and evolution, because bota nists
found themselves rather disorientated by the scattered, often
hardly accessible chemical literature and the fact that the
chemical evidence was difficult for them to evaluate Although the
pioneering work of E. C."
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