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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.
Like all species of Quercus, those of subgenus Cerris are trees or shrubs with acorn-like fruit in which a cup covers at least the base of the nut.Members of subgenus Cerris are distinguished from members of subgenus Quercus by few morphological features, their separation being largely determined by molecular phylogenetic evidence.
A 2017 classification of Quercus, based on multiple molecular phylogenetic studies, divided the genus into two subgenera and eight sections: [29] Subgenus Quercus – the New World clade (or high-latitude clade), mostly native to North America Section Lobatae Loudon – North American red oaks
Quercus: Subgenus: Quercus subg. Quercus: ... is a deciduous species of tree in the white oak group (Quercus sect. Quercus). The species was often called Quercus ...
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 ...
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 ().
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.