All species look alike microscopically.
Throughout the eastern United States, from the Atlantic coast west to Minnesota, Iowa, Nebraska, Kansas, Oklahoma and Texas. The Tree Black Willow trees reach heights of 140 feet, with a diameter of 4 feet. The sapwood of Black Willow is light tan, while the heartwood is pale reddish brown to grayish brown. It has no characteristic odor or taste. It is soft, but does not splinter when dented.