Japanese Walnut - Juglans ailantifolia
Walnut Family: Juglandaceae
Native to Japan; introduced to North America circa 1860.  Hardy to USDA Zone 5
 
The Japanese Walnut is a deciduous tree, to 40-65 ft (15-20 m) tall, with a broad, round crown. The leaves are alternate, pinnately compound, 60 cm long, odd number of leaflets, 11 to 17. Each leaflet ovate-oblong to oblong, 7-18 cm long, serrate, upper surface bright green. Pubescent at first but then glabrous or nearly, pubescent below, and densely granular and pubescent on the midrib and leaf stalk (rachis). Male catkins 15-30 cm long; female catkins with 12-20 flowers. The fruit is globose to ovoid, sticky, rugose, thick shelled. Tree needs full sun.