Juglans nigra, more commonly known as Walnut trees, grow primarily in eastern North America. They're best known for producing nuts that are packed with essential fatty acids. Walnut trees are also known to pack a powerful punch of visual interest when used as flooring. It's typical color is chocolate brown with some color variation that includes creamy tan, which is associated with a Walnut tree's sapwood. The wood's rich color does wonders at bringing warmth to a space.