Description
Black walnut (Juglans nigra) of eastern North America and English, or Persian, walnut (J. regia), native to Iran, are valuable timber trees that produce edible walnuts. The butternut (J. cinerea) of eastern North America also produces an edible nutlike seed. The English walnut is grown in parts of North and South America for commercial nut production. English walnut nut is used as a part of the diet to lower cholesterol in people with high cholesterol.
