Lithocarpus edulis

Lithocarpus edulis is a species of flowering plant in the family Fagaceae. It is sometimes referred to by the common name Japanese stone oak and is native to Japan and the Ryukyu Islands. It is an evergreentree growing up to 15 metres tall. The nuts are edible for people but taste bitter. The nuts contain tannins, however soaking them in water removes them. It is cultivated as an ornamental plant.