The Black Walnut has dark thick ski trail bark with alternate branches (http://ohioline.osu.edu/b899/pdf/b899.pdf). Its stems are green with compound opposite leaves and green walnuts. Pioneers would use the dye from the nuts to dye their clothes. It is known as a flowering tree that is commonly seen in moist open spaces. One will most likely spot the Black Walnut in meadows, pastures and a slope. They can reach between 70-150 feet high and a diameter of 2-4 feet. Its scientific name is Juglahs Nigra.