The ring-cupped oak, whose botanical name is quercus glauca, is a small to medium-sized evergreen broadleaf tree that grows to a height of 15 to 20 meters.
Also called Japanese blue oak, it is a member of the beech family (fagaceae).
The tree is native to East and South Asia and is found in Afghanistan, Bhutan, China, northern and eastern India, southern Japan, Kashmir, Korea, Myanmar, Nepal, and Vietnam.
Its newly sprouted leaves are dark purplish red and quickly turn glossy green above and blue-green below.
Its leaves are 60-13 mm long and 20-50 mm wide with serrated edges.
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