[vc_row content_text_aligment="" use_row_as_full_screen_section="no"][vc_column][vc_column_text] Birch (Betula) A birch is a thin-leaved deciduous hardwood tree of the genus Betula (/ˈbɛtjʊlə/), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech-oak family Fagaceae. The genus Betula contains 30 to 60 known taxa