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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 all the other sections.
Subgenus Quercus occurs mainly in the Americas, with some species native to Eurasia and North Africa, and may be called the New World clade or the high-latitude clade. Subgenus Cerris is primarily Eurasian, with a few species in North Africa, and may be called the Old World clade or the mid-latitude clade.
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.
Subgenus Quercus – the New World clade ... By this definition, many species of Quercus would be lumped together according to their geographic and ecological habitat
Quercus durata, commonly known as leather oak, is a species of oak in the white oak group (subgenus Quercus, section Quercus). The common name "leather oak" is derived from the leathery texture on the lop of its leaves. It is endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada.
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 suber is a species of the section Cerris to which, for example, the following species also belong: Valonia oak (Quercus macrolepis) Turkey oak (Quercus cerris) Quercus × crenata; Macedonian oak (Quercus trojana) Characteristic for the section are the hairless pericarp and the usually two-year ripening time of the fruits. The cork oak ...
Trigonobalanus Forman 1962—three species, tropical southeast Asia, Northern South America (three species of Colombobalanus and Formanodendron are included) The Quercus subgenus Cyclobalanopsis is treated as a distinct genus by the Flora of China, but as a section or subgenus by most taxonomists.