Alnus serrulata is commonly known as the hazel alder or smooth alder. However, there are a few synonymous names for this species, including Alnus sericea, Alnus incana var. serrulata, and Alnus incana subsp. serrulata. These names are used interchangeably to refer to this deciduous tree that grows up to 50 feet tall. The leaves of the hazel alder are serrated and turn yellow-brown in the fall. The tree is valued for its ornamental qualities, as well as for its wood, which is used to make paper and for construction. In addition, the hazel alder provides habitat for various bird species and other wildlife.