| Status | LC |
|---|---|
| Status system | IUCN3.1 |
| Taxon | Quercus glauca |
| Display parents | 2 |
| Parent | Quercus sect. Cyclobalanopsis |
| Authority | Thunb. 1784 not F. Buerger ex Blume 1851 nor Martrin-Donos & Timb.-Lagr. 1864 nor Bosc ex Loisel. 1825 nor Oerst. 1869[1] |
Quercus glauca (syn. Cyclobalanopsis glauca), commonly called ring-cupped oak[2] or Japanese blue oak,[3] 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.[4] It is placed in subgenus Cerris, section Cyclobalanopsis.[5]
Description
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).[4]
Cultivation and uses
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.[6]
References
- ^ Tropicos, Quercus glauca
- ^ "Quercus glauca". Missouri Botanical Garden.
- ^ "Quercus glauca". JC Raulston Arboretum Plants. North Carolina State University.
- ^
- ^ 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