Ring-cupped oak, scientific name quercus glauca, is a small to medium-sized evergreen broad-leaved tree.
Also called Japanese blue oak, it is a member of the beech (fagaceae) family and usually grows to a height of 15 to 20 meters.
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.
Newly grown leaves are distinct dark purplish-red, turning glossy green above and glossy blue-green below as they mature. They are 60-13 mm long and 20-50 mm wide with jagged margins.
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