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An oak is a tree or shrub in the genus Quercus (; Latin "oak tree") of the beech family, Fagaceae. There are approximately 500 extant species of oaks. 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 contains the largest number of oak species, with approximately 90 occurring in the United States, while Mexico has 160 species of which 109 are endemic. The second greatest center of oak diversity is China, which contains approximately 100 species.
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Population | 206730 |
Pskov (Russian: Псков, IPA: [pskof] (listen); see also names in other languages) is a city in northwestern Russia and the administrative center of Pskov Oblast, located about 20 kilometers (12 mi) east from the Estonian border, on the Velikaya River. Population: 203,279 (2010 Census); 202,780 (2002 Census); 203,789 (1989 Census).