> Analysis of numerous samples from different geographic regions led to the disclosure that the chemical composition of bee glue is highly variable.  It is well documented that in the temperate zone all over the world, the main source of bee glue is the resinous exudate of the buds of poplar trees, mainly the black poplar Populus nigra.  The main source of Brazilian bee glue turned out to be the leaf resin of Baccharis dracunculifolia.  Recently the chemistry of Cuban propolis caught the attention of scientists. The plant source of this propolis type was detected to be the floral resin of Clusia Rosea.  In spite of the great differences in the chemical composition of propolis from different geographic locations, all samples exhibit significant antibacterial and antifungal (and most of them antiviral) activity.

-- "Recent trends and important developments in propolis research" by
Vassya Bankova

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