The Tree of Birch Family consists of two species, ALDER (5 letters) and HAZEL (5 letters). ALDER is a genus of flowering plants in the family Betulaceae, which includes birch, ALDER, HAZEL, hornbeam, and hop-hornbeam. HAZEL is a genus of deciduous trees and shrubs native to temperate Europe, Asia, and North America. Both species are commonly found in temperate climates and are often used for landscaping and timber production.