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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. Fossil oaks date back to the Middle Eocene.
Quercus treubiana is a member of the Quercus (oak) genus, [2] [3] placed in subgenus Cerris, section Cyclobalanopsis. [4] It is found in the tropical mountain forests of Borneo and Sumatra at altitudes between 600 and 2200m. [5] It is named for Melchior Treub, 1851–1910, who was until 1909 Director of the Bogor Botanical Gardens, Indonesia.
Quercus sumatrana is an oak native to the islands of Sumatra and Borneo in Indonesia and Malaysia.On Borneo, it is reported from Sarawak, Sabah and East Kalimantan.This is a very large emergent tree up to 60 m (200 ft) tall, growing in mixed dipterocarp forest up to 1,400 m (4,600 ft) elevation.
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 subsericea [2] is a tree species in the beech family Fagaceae.There are no known subspecies. [3] [4] It is placed in subgenus Cerris, section Cyclobalanopsis.[5]This oak species is an emergent tropical forest tree, growing up to 52 m. tall and 0.86 m. dbh [6] and has been recorded from Malaysia, Indonesia, Philippines ().
Quercus robur (from the Latin quercus, "oak" + robur derived from a word meaning robust, strong) was named by Carl Linnaeus in Species Plantarum (1753). [11] [12] It is the type species of the genus and classified in the white oak section (Quercus section Quercus). [13] It has numerous common names, including "common oak", "European oak" and ...
Quercus acutissima is closely related to the Turkey oak, classified with it in Quercus sect. Cerris, a section of the genus characterized by shoot buds surrounded by soft bristles, bristle-tipped leaf lobes, and acorns that mature in about 18 months. [3]
Quercus suber, commonly called the cork oak, is a medium-sized, evergreen oak tree in the section Quercus sect. Cerris.It is the primary source of cork for wine bottle stoppers and other uses, such as cork flooring and as the cores of cricket balls.