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e) A recent research has revealed that more than 60,000 species of trees are available globally.

d) The BCGI (Botanical Gardens Conservation International) has compiled the list of trees on the basis of data gathered from its network of 500 member organizations.

a) The researchers claim to have collected information over a period of two years from sources including over 500 published contents and 80 experts in the BCGI's network.

b) The data will be kept updated with the discovery of new species or the extinction of some, said the researchers.

c) All the data required for the world's trees is now available in one database, thanks to GlobalTreesearch.