Turczaninov Hornbeam - Carpinus turczaninovii
Also commonly called Korean Hornbeam. Hardiness Zones: 5 / Height: 15 ft Spread: Form: upright / Type: Deciduous tree
Annual Growth Rate: less than 12 inches. This rare hornbeam seems to be of intese interest to Bonsai growers.
 
Turczaninov Hornbeam Foliage
Comments: Korean Hornbeam is a small tree with dense, upright branching. The foliage develops fall color that is a combination of red, orange and yellow. The catkins are about 2 inches long. (University of Michigan Extension)
 

This specimen was started from seed 26 years ago. (The two spindly trunks in the foreground are the subject). I'm not sure if this specimen represents the usual growth habit, as it is essentially located in full shade most of the day. It does not seem to match the UM description, but has been vetted by professional botanists at The Morton Arboretum at Lisle, Illinois, USA.