- Quercus glauca
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Ring-cupped Oak 
Scientific classification Kingdom: Plantae (unranked): Angiosperms (unranked): Eudicots (unranked): Rosids Order: Fagales Family: Fagaceae Genus: Quercus Species: Q. glauca Binomial name Quercus glauca
(Thunb.)Quercus glauca (syn. Cyclobalanopsis glauca, Q. annulata), also known as Ring-cupped Oak, Japanese Blue Oak or Glaucous-leaf Oak, is a species in the genus Quercus, native to Asia from Afghanistan east to southern Japan (アラカシ;粗樫), Taiwan (青剛櫟), and Vietnam.
It 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, 6-13 cm long and 2-5 cm broad, with a serrated margin. The flowers are catkins, and the fruit are acorns 1-1.6 cm long, with an intricate ring pattern on the acorn cup.
Cultivation and uses
It is planted as an ornamental tree in regions of Europe and North America with mild winters.
External links
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