''Quercus rex'' is an Asian species of tree in the family

Fagaceae The Fagaceae are a family of flowering plants that includes beeches, chestnuts and oaks, and comprises eight genera with about 927 species. Fagaceae in temperate regions are mostly deciduous, whereas in the tropics, many species occur as eve ...

. It has been found in the

seasonal tropical forest Seasonal tropical forest, also known as moist deciduous, semi-evergreen seasonal, tropical mixed or monsoon forests, typically contain a range of tree species: only some of which drop some or all of their leaves during the dry season. This tropi ...

s of northern Indochina ( Laos,

Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John Wells explai ...

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making it ...

), northeastern India, and also in the province of

Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the ...

in southwestern China.Flora of China, ''Cyclobalanopsis rex'' (Hemsley) Schottky, 1912. 大果青冈 da guo qing gang
/ref> It is placed in subgenus ''Cerris'', section ''Cyclobalanopsis''. ''Quercus rex'' is a large tree up to 30 m. tall. Twigs are pale brown with a woolly coating of hairs. Leaves can be as much as 270 mm long.Hemsley, William Botting 1900. Hooker's Icones Plantarum 27(3): plate 2663 and subsequent unnumbered text page
2- page fold-out line drawing, description in Latin, commentary and figure captions in English The

acorn The acorn, or oaknut, is the nut of the oaks and their close relatives (genera '' Quercus'' and ''Lithocarpus'', in the family Fagaceae). It usually contains one seed (occasionally two seeds), enclosed in a tough, leathery shell, and bo ...

oblate In Christianity (especially in the Roman Catholic, Orthodox, Anglican and Methodist traditions), an oblate is a person who is specifically dedicated to God or to God's service. Oblates are individuals, either laypersons or clergy, normally li ...

, 25-35 × 35–50 mm, pale greyish-orange and tomentose when young; the apex is rounded to impressed; the scar is 20–25 mm in diameter and depressed. In China, flowering is in April–May, acorns are found from October–November.

References

External links

line drawing, Flora of China Illustrations vol. 4, fig. 381, drawings 1-3 at leftPhoto of herbarium specimen at Missouri Botanical Garden, collected in Yunnan, showing leavesSecond photo of herbarium specimen at Missouri Botanical Garden, collected in Yunnan, showing acorns
* rex Flora of Arunachal Pradesh Trees of China Flora of Yunnan Plants described in 1900 Trees of Indo-China {{Quercus-stub