Quercus glauca
| Ring-cupped oak | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Fagaceae |
| Genus: | Quercus |
| Subgenus: | Quercus subg. Cerris |
| Section: | Quercus sect. Cyclobalanopsis |
| Species: | Q. glauca |
| Binomial name | |
| Quercus glauca | |
| Synonyms[3] | |
|
List
| |
Quercus glauca (syn. Cyclobalanopsis glauca), commonly called ring-cupped oak[4] or Japanese blue oak,[5] is a tree in the beech family (Fagaceae). It is native to eastern and southern Asia, where it is found in Afghanistan, Bhutan, China, northern and eastern India, southern Japan, Kashmir, Korea, Myanmar, Nepal, Taiwan, and Vietnam.[6] It is placed in subgenus Cerris, section Cyclobalanopsis.[7]
Description
[edit]Quercus glauca is a small to medium-sized evergreen broadleaf tree growing to 15–20 m tall. The leaves are a distinct deep purple-crimson on new growth, soon turning glossy green above, glaucous blue-green below, 60–13 mm long and 20–50 mm broad, with a serrated margin. The flowers are catkins, and the fruit are acorns 1–1.6 cm long, with series of concentric rings on the outside of the acorn cup (it is in the "ring-cupped oak" sub-genus).[6]
Cultivation and uses
[edit]It is planted as an ornamental tree in regions of Europe and North America with mild winters.
Its acorns are edible. When dried and ground into powder they can be mixed with cereals and used as flour. The roasted seeds can be used as a coffee substitute. The wood of Quercus glauca is a valuable fuelwood. Its leaves and stems are relished by deer.[8]
Gallery
[edit]
Detail of acorns and buds
Dried leaves and acorns
References
[edit]- ↑ Carrero, C. (2019). "Quercus glauca". IUCN Red List of Threatened Species. 2019 e.T194825A2363524. doi:10.2305/IUCN.UK.2019-1.RLTS.T194825A2363524.en. Retrieved 9 April 2026.
- ↑ Tropicos, Quercus glauca
- ↑ "Quercus glauca Thunb". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 28 July 2026.
- ↑ "Quercus glauca". Missouri Botanical Garden.
- ↑ "Quercus glauca". JC Raulston Arboretum Plants. North Carolina State University.
- 1 2 Huang, Chengjiu; Zhang, Yongtian; Bartholomew, Bruce. "Cyclobalanopsis glauca". Flora of China. Vol. 4 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- ↑ Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "Appendix 2.1: An updated infrageneric classification of the oaks" (xls). figshare. doi:10.6084/m9.figshare.5547622.v1. Retrieved 2023-02-24.
- ↑ Heuzé V., Tran G., Lebas F., 2017. Blue Japanese oak (Quercus glauca). Feedipedia, a programme by INRA, CIRAD, AFZ and FAO. https://www.feedipedia.org/node/109
