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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 .
The genus Quercus contains about 500 known species, plus about 180 hybrids between them. [1] The genus, as is the case with many large genera, is divided into subgenera and sections. Traditionally, the genus Quercus was divided into the two subgenera Cyclobalanopsis, the ring-cupped oaks, and Quercus, which included
Quercus sect. Quercus has been known, either in whole or part, by a variety of names in the past, including Quercus sect. Albae, Quercus sect. Macrocarpae and Quercus sect. Mesobalanus. Members of the section may be called white oaks. The section includes all white oaks from North America (treated by Trelease as subgenus Leucobalanus). [2]
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Quercus subgenus Cerris is one of the two subgenera into which the genus Quercus was divided in a 2017 classification (the other being subgenus Quercus). It contains about 140 species divided among three sections. It may be called the Old World clade or the mid-latitude clade; all species are native to Eurasia and North Africa.
Quercus robur, the pedunculate oak or English oak, [3] [4] is a species of flowering plant in the beech and oak family, Fagaceae. It is a large tree, native to most of Europe and western Asia , and is widely cultivated in other temperate regions.
Quercus sinuata var. breviloba (Latin quercus, "oak" + sinuata, species epithet from nominative feminine singular of Latin sinuatus [13], participle of sinuo, "to bend or bow out in curves" [14] + var. (variety or varietas) breviloba, a combination of Latin brevis, "short," [15] and loba, "lobed") is an infraspecific scientific name inspired by ...
Quercus pubescens is a medium-sized deciduous tree growing up to 20 metres (66 feet). [2] Forest-grown trees grow tall, while open-growing trees develop a very broad and irregular crown. They are long-lived, to several hundred years, and eventually grow into very stout trees with trunks up to 2 m ( 6 + 1 ⁄ 2 ft) in diameter.