Castanopsis sieboldii; chinquapin species
A species of evergreen tree in the beech family, native to Japan and East Asia. The name is usually written in katakana as イタジイ. Related to すだ椎 (スダジイ).
See also: スダジイ
Castanopsis sieboldii is found in warm-temperate evergreen forests.
The nuts of Castanopsis sieboldii are edible.
The name likely derives from the Japanese word いた (board) and 椎 (chinquapin), possibly referring to the tree's use in construction or its flat leaves. The exact origin is uncertain.