Carpinus turczaninovii
Carpinus turczaninovii, the Turczaninow hornbeam or Korean hornbeam, is a species of flowering plant in the family Betulaceae, native to central China, the Korean Peninsula, and central and southern Japan. It is a large shrub or small tree typically  tall and about 75% as wide, and is hardy to USDA zone 5b. It is available from commercial suppliers, and can handle very hard pruning.

References

turczaninovii
Plants used in bonsai
Flora of North-Central China
Flora of South-Central China
Flora of Korea
Flora of Japan
Plants described in 1869