The Family Betulaceae is commonly known as the Birch family. This family of trees and shrubs is characterized by their pollen being allergenic, and their leaves being simple, alternate, and doubly serrate. The Betulaceae family includes many species of trees that are commonly found in North America and Europe, including birch, alder, hazel, and hornbeam. While there are no true synonyms for this family name, it is commonly referred to simply as the Birch family due to the dominance of birch species in the family. Other names that may be used to refer to this family include the Alder family, Hazelnut family, and Hornbeam family.