TAILIEUCHUNG - Báo cáo khoa học: "Infrageneric classification of Quercus (Fagaceae) and typification of sectional names"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Infrageneric classification of Quercus (Fagaceae) and typification of sectional names. | Ann Sci For 1993 50 Suppl 1 25s-34s Elsevier INRA 25s Review article Infrageneric classification of Quercus Fagaceae and typification of sectional names KC Nixon LH Bailey Hortorium Cornell University Ithaca NY 14853 USA Summary The genus Quercus L the true oaks is widespread in the Northern hemisphere in habitats ranging from temperate and tropical forests to dry thorn scrub and semi-desert. As far as is known all species are anemophilous. The genus is most closely related to Trigonobalanus Forman Colombobalanus Nixon and Crepet and Formanodendron Nixon and Crepet 3 extant tropical monotypic genera. The oldest unequivocal oak fossils are Oligocene in age although fossilized catkins and stellate trichomes that may represent earlier Quercus are preserved in Baltic amber of uncertain Early Tertiary age. Trigonobalanoid fossils are known from the Oligocene and Paleocene of North America and later deposits in Europe. A subgeneric and sectional classification of Quercus that is slightly modified from that proposed by Camus is most consistent with recent phylogenetic analyses within Quercus. Such a classification recognizes 2 subgenera Quercus and Cyclobalanop-sis Oersted Schneider. The latter is restricted to eastern Asia and Malesia. Subgenus Quercus is divided into sections Lobatae Loudon red oaks North and South America Protobalanus Trelease Schwarz intermediate oaks western North America and Ouercus white oaks E and w hemispheres . Two groups of white oaks that are sometimes recognized as sections Ilex Eurasia and Cerris Eurasia are considered part of section Quercus but merit subsectional or higher rank following more complete analyses. Quercus I taxonomy phylogeny subgenera sections Resume Classification à rintérieur du genre Quercus et caractérisation des noms de sections. Le genre Quercus les vrais chênes couvre I ensemble de 1 hémisphère nord et colonise des habitats allant des torêts tempérées et tropicales aux formations arbustives et semi désertiques. D .

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