Ecologists recognize at least 13 major tree communities within California. Five of these are associated with the coastal regions. There are approximately 129 species of native trees in California, 63 of which are endemic. It is estimated that another 1,000 have been introduced from all over the world, but most of these are limited to private gardens. Nevertheless, about 30-50 introduced species have become naturalized, including the ubiquitous blue gum, Eucalyptus globulus.
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