''Quercus edithiae'' is a 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 evergre ...

and the " ring-cupped oak" sub-genus. It has been found in Vietnam and also in southern China, in the Provinces of

Guangdong Guangdong (, ), alternatively romanized as Canton or Kwangtung, is a coastal province in South China on the north shore of the South China Sea. The capital of the province is Guangzhou. With a population of 126.01 million (as of 2020) ...

Guangxi Guangxi (; ; Chinese postal romanization, alternately romanized as Kwanghsi; ; za, Gvangjsih, italics=yes), officially the Guangxi Zhuang Autonomous Region (GZAR), is an Autonomous regions of China, autonomous region of the People's Republic ...

, and

Hainan Hainan (, ; ) is the smallest and southernmost province of the People's Republic of China (PRC), consisting of various islands in the South China Sea. , the largest and most populous island in China,The island of Taiwan, which is slightly l ...

.Flora of China, Cyclobalanopsis edithiae (Skan) Schottky, 1912. 华南青冈 hua nan qing gang
/ref> In Vietnam it is called ''sồi editha''. It is placed in subgenus ''Cerris'', section ''Cyclobalanopsis''. ''Quercus edithiae'' is a tree up to 20 m. tall with hairless twigs. The leathery leaves are glabrous, oblong-elliptic to obovate, 50-160 × 20–60 mm, with a 20–30 mm petiole. 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 borne ...

is ellipsoid to cylindric-ellipsoid, 30-45 × 20–30 mm, with a scar approx. 7 mm in diameter.Skan, Sidney Alfred 1900. Hooker's Icones Plantarum 27(3): plate 2661 iplus subsequent unnumbered text page
description in Latin, commentary in English, full-page line drawing of ''Quercus edithiae''

References

External links

line drawing, Flora of China Illustrations vol. 4, figure 377, drawings 5-7 at upper right
edithiae Flora of Vietnam Trees of Vietnam Flora of China Plants described in 1900 {{Quercus-stub