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Family: Sapindaceae
Mid-Atlantic bloom time: March - May
Eastern Boxelder is dioecious (separate "male" and "female" trees) and has compound leaves with typically 3-5 leaflets.
Note the individual leaflet shape is similar to Poison Ivy, which can cause some confusion when the tree is young or its unclear whether a vine or branch is hanging in your face. The two can easily be differentiated by noting that Boxelder opposite compound leaves with 3-5 leaflets, whereas Poison Ivy has alternate compound leaves with only 3 leaflets.