10. Atlas Cedar

This tree, recognisable by its glaucous (bluish-green) needles, is native to the Mediterranean region. This cedar can hybridize with the Cedar of Lebanon, to which it is closely related. Some botanists are unable to distinguish between the 2 species.
What is the difference between a native tree and an exotic tree? A native species is one that is still present in a given area even though it arrived there without human intervention before 1500. Botanical surveys began in the 16th century. They began first around the Mediterranean, then along the American coast (17th and 18th centuries), then inland, and in the 19th century in Asia.