An oak is a hardwood tree or shrub in the genus Quercus of the beech family.They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup.The genus is widely distributed in the Northern Hemisphere; it includes some 500 species, both deciduous and evergreen.Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided ... More @Wikipedia
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