ケヤキ
Zelkova serrata (Japanese zelkova, Japanese elm or keyaki; ; ; ) is a species of the genus "Zelkova" native to Japan, Korea, eastern China and Taiwan. It is often grown as an ornamental tree, and used in bonsai. There are two varieties, "Zelkova serrata" var. "serrata" in Japan and mainland eastern Asia, and "Zelkova serrata" var. "tarokoensis" (Hayata) Li on Taiwan which differs from the type in its smaller leaves with less deeply cut serration on the margins.