Walnut

Walnut trees, genus "Juglans", are plants which mostly grow in the northern hemisphere. They can reach ten to forty metres (30-130 ft) in height. They are used for timber. The wood is very hard, and dark in color. It is mostly used in furniture. 
The fruit is eaten and can be used to make oil. The fruit of "Juglans" are called walnuts. Material of the walnut's outer casing was used by Native American tribes to poison fish.
Walnut trees grow from Europe eastwards to the Himalayas and southwest China. In America they are found in places from Canada to Argentina.