In terms of diversity, orchids are one of the most successful groups of flowering plants, with over 22,000 species. Both pollinating animals
and mycorrhizal fungi are believed to have been important in the diversification of orchids (and other flowering plants), but the
mechanisms by which these above- and below-ground mutualisms affect
speciation remain obscure. [...]
http://www.physorg.com/news/2011-09-orchids-successful.html
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Eduardo
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