Oak

Tree or shrub in the genus Quercus / From Wikipedia, the free encyclopedia

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An oak is a tree or shrub in the genus Quercus (/ˈkwɜːrkəs/;[1] Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks.[2] 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). 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. 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 second greatest area of oak diversity is China, with approximately 100 species.[3]

Solitary oak, the Netherlands
Oak: male flowers
The leaves of a young oak
Pubescent oak tree in four seasons, Zmajevac, Fruška gora, Serbia

Quick facts: Oak Temporal range Paleocene-Eocene boundary...
Oak
Temporal range: Paleocene-Eocene boundary-Recent 56–0 Ma possible Paleocene & Late Cretaceous records
Foliage and acorns of Quercus robur
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Fagaceae
Subfamily: Quercoideae
Genus: Quercus
L.
Species

See List of Quercus species

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