Trochodendron aralioides, Wheel Tree.

  USDA Cold Hardiness Zone: 6 Native Range: Japan. Soil: Moist, well drained. Light: Full sun to light shade. Height in the Garden: Up to 20' in the garden. Up to 60' in the wild after like about 1000 years. Attributes: Broadleaf evergreen, small tree with unusual, attractive flowers. It is aralia like in appearance as the name suggests. Slow growing, but worth the wait. Can form a multi-stem large shrub or small tree with time. Notes: A true connoisseur's plant for sure.  Uses: Specimen tree, understory tree.