Ring-cupped oak with the botanical name quercus glauca is an evergreen broadleaf tree of the beech family (fagaceae).
Commonly also called Japanese blue oak, it is a small to medium-sized tree that grows to a height of 15 to 20 meters.
The tree is native to East and South Asia, growing naturally in Afghanistan, Bhutan, China, northern and eastern India, southern Japan, Kashmir, Korea, Myanmar, Nepal, and Vietnam.
The leaves are 60-13 mm long and 20-50 mm wide with serrated edges.
In new leaves they are dark purple-dark red, quickly changing to glossy green above and turquoise below.
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