Ring-cupped oak, whose botanical name is quercus glauca, is a small to medium-sized evergreen broadleaf tree that grows to 15 to 20 meters tall.
Also called Japanese blue oak, it belongs to the beech family (fagaceae).
This plant is native to East and South Asia and can be found in Afghanistan, Bhutan, China, northern and eastern India, southern Japan, Kashmir, Korea, Myanmar, Nepal, and Vietnam.
New leaves are distinctly dark purple-dark red, turning glossy green on the upper surface as soon as they mature and blue-green on the lower surface, 60-13 mm long and 20-50 mm wide, with serrated edges.
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