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Sorry, this content is not available in your region. Oak tree” and “Quercus” redirect here. There are approximately 500 extant species of oaks. Linnaeus described only five species of oak from eastern North America, based on general leaf form. The most recent classification of Quercus divides the genus into two subgenera and eight sections. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources.

Trees or shrubs that produce nuts, specifically acorns, as fruits. Acorns mature in one year for annual trees and two years for biannual trees. Protobalanus, the canyon live oak and its relatives, in the southwestern United States and northwest Mexico. 18 months and taste very bitter. The inside of the acorn shell appears woolly. The leaves typically have sharp lobe tips, with bristles at the lobe tip.

Ponticae, a disjunct including just two species. Styles are short and the acorns mature in 12 months. The leaves have large stipules, high secondary venation, and are highly toothed. Virentes, the southern live oaks of the Americas. The leaves are evergreen or subevergreen.

North America, Central America and northern South America. Cyclobalanopsis, the ring-cupped oaks of eastern and southeastern Asia. Cerris, the Turkey oak and its relatives of Europe and Asia. The inside of the acorn’s shell is hairless. Its leaves typically have sharp lobe tips, with bristles at the lobe tip. Ilex, the Ilex oak and its relatives of Eurasia and northern Africa. 24 months, appearing hairy on the inside.