Celtis jessoensis

About

Celtis jessoensis, known as the Japanese hackberry or Jesso hackberry, is a species of hackberry native to Japan and Korea. It is a deciduous tree growing to 20–25 m (66–82 ft) tall. The leaves are 5–9 cm (2.0–3.5 in) long and 3–4 cm (1.2–1.6 in) broad, with a sharply serrated margin, glaucous beneath and downy on the leaf veins.

Summary from Wikipedia