Box elder, known scientifically as Acer negundo, is a species of maple tree commonly found in North America. The term "box elder" is derived from the woody fruits or "boxes" that grow on the tree and the similarity of the leaves to those of the elder tree. However, there are several synonyms for the term box elder, including ash-leaved maple, cut-leaved maple, and three-leaved maple. These names are based on the tree's physical characteristics, such as its ash-like leaves with jagged edges, or its three-parted leaves. Box elder is a popular shade tree, often planted in urban areas due to its fast growth rate and hardiness.