Quercus glauca
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| Ring-cupped Oak | ||||||||||||||
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| 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, Taiwan, 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.
[edit] Cultivation and uses
It is planted as an ornamental tree in regions of Europe and North America with mild winters.
