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. Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided into Old World and New World clades, but many oak species hybridise freely, making the genus's history difficult to resolve.
Quercus marilandica, the blackjack oak, is a small oak, one of the red oak group Quercus sect. Lobatae. It is native to the eastern and central United States.
Quercus tomentella, the island oak, island live oak, or Channel Island oak, is an oak in the section Protobalanus. It is native to six islands: five of the Channel Islands of California and Guadalupe Island, part of Baja California.
Quercus canariensis, the Algerian oak, Mirbeck's oak or zean oak, is an oak native to southern Portugal, Spain, Tunisia, Algeria and Morocco. Despite the scientific name, it does not occur naturally today in the Canary Islands, though it may have in the past. It is placed in section Quercus.
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 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 gomeziana 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.
