IUCN threat status:

Critically Endangered (CR)


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Quercus glauca

Quercus glauca - MHNT

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[edit]

It is planted as an ornamental tree in regions of Europe and North America with mild winters.


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Source: Wikipedia

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