![]() ![]() Section Cyclobalanopsis – cycle-cup oaks of East Asia.Subgenus Cerris – the Old World clade (or mid-latitude clade), exclusively native to Eurasia.Section Quercus – white oaks from North America and Eurasia.Section Virentes – American southern live oaks.Section Ponticae – with a disjoint distribution between western Eurasia and western North America.Section Protobalanus – North American intermediate oaks.Section Lobatae – North American red oaks.Subgenus Quercus – the New World clade (or high-latitude clade), mostly native to North America.The genus was divided into two subgenera and eight sections: Ī 2017 classification of Quercus was based on multiple molecular phylogenetic studies and data, mainly originating between 20. The second greatest area of oak diversity is China, with approximately 100 species. North America has the largest number of oak species, with approximately 160 species in Mexico, of which 109 are endemic and about 90 in the United States. The genus Quercus is native to the Northern Hemisphere and includes deciduous and evergreen species extending from cool temperate to tropical latitudes in the Americas, Asia, Europe, and North Africa. The common name "oak" also appears in the names of species in related genera, notably Lithocarpus (stone oaks), as well as in those of unrelated species such as Grevillea robusta (silky oaks) and the Casuarinaceae (she-oaks). There are approximately 500 extant species of oaks. Protobalanus (Trelease) O.SchwarzĪn oak is a tree or shrub in the genus Quercus ( / ˈ k w ɜːr k ə s/ Latin "oak tree") of the beech family, Fagaceae. ![]() ![]() Possible Paleocene & Late Cretaceous records ![]()
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