Fraxinus Quadrangulata is commonly known as the blue ash tree. This species of tree belongs to the olive family and is native to North America. The blue ash tree is known for its strong wood and its tall height, which can reach up to 80 feet. Some synonyms for the blue ash tree include the four-cornered ash, the square-stemmed ash, and the velvet ash. These synonyms are derived from the tree's unique square-shaped branches and its soft, velvety foliage. The blue ash tree is an important species for the ecology of its region, providing essential habitat and resources for a variety of animals.