An oak is a tree or shrub in the genus Quercus 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, as well as in those of unrelated species such as Grevillea robusta 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.
Quercus petraea, commonly known as the sessile oak, Cornish oak, Irish Oak or durmast oak, is a species of oak tree native to most of Europe and into Anatolia and Iran. The sessile oak is the national tree of Ireland, and an unofficial emblem in Wales and Cornwall.
Quercus myrsinifolia is an Asian species of tree in the beech family Fagaceae. It has several common names, including bamboo-leaf oak, Chinese evergreen oak, and Chinese ring-cupped oak. Its Chinese name is 小叶青冈; pinyin: xiǎo yè qīng gāng, which means little leaf ring-cupped oak, in Japan it is called white oak and in Korea it is known as gasinamu (가시나무). It is native to east central and southeast China, Japan, Korea, Laos, northern Thailand, and Vietnam. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus asymmetrica is an oak tree species in the beech family Fagaceae. It is found in China and northern Vietnam. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus pyrenaica, also known as Pyrenean oak, or Spanish oak is a tree native to southwestern Europe and northwestern North Africa. Despite its common name, it is rarely found in the Pyrenees Mountains and is more abundant in northern Portugal and north and northwestern Spain.
Quercus mespilifolia is a tree species in the family Fagaceae. There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus petelotii is the accepted name of an endemic oak tree species in the beech family Fagaceae; there are no known sub-species. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus dankiaensis is the accepted name of tree species the beech family Fagaceae; there are no known subspecies. It is placed in Quercus sect. Cyclobalanopsis.
Quercus arbutifolia, synonym Quercus obovatifolia, is a species of oak in the beech family Fagaceae, native to southeast China and Vietnam. It is placed in Quercus sect. Cyclobalanopsis, the ring-cupped oaks. There are no known subspecies.
Quercus braianensis is a tree species in the beech family Fagaceae. There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus rupestris is a small tree species in the beech family Fagaceae. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus gemelliflora is a tree species in the beech family Fagaceae. there are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus subsericea is a tree species in the beech family Fagaceae. There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus setulosa is the accepted name of an oak species in genus Quercus of the family Fagaceae. It is now placed in section Ilex of subgenus Cerris.
Quercus quangtriensis is a tree species in the beech family Fagaceae; there are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus macrocalyx is a tree species in the beech family Fagaceae There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus chrysocalyx is a tree species in the beech family Fagaceae; there are no known subspecies. It is native to Cambodia, China (Yunnan), Laos, Thailand, and Vietnam. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus annulata is a tree species in the beech family Fagaceae. There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.
Quercus treubiana is a member of the Quercus (oak) genus, placed in subgenus Cerris, section Cyclobalanopsis. It is found in the tropical mountain forests of Borneo and Sumatra at altitudes between 600 and 2200m. It is named for Melchior Treub, 1851–1910, who was until 1909 Director of the Bogor Botanical Gardens, Indonesia. It was first formally named by Karl Otto von Seemen in 1906 in the Bulletin de Département de l’Agriculture aux Indes Néerlandaises. It is also been referred to as Cyclobalanopsis treubiana (Seemen).
