Betulacea

Betulaceae, the birch family, includes six genera of deciduous nut-bearing trees and shrubs, including the Birch, Alder, hazels, hornbeams, hazel-hornbeam, and hop-hornbeams numbering a total of 167 species. They are mostly natives of the temperate Northern Hemisphere, with a few species reaching the Southern Hemisphere in the Andes in South America. Their typical flowers are catkins and often appear before leaves.

Source: https://en.wikipedia.org/wiki/Betulaceae