. "*Betulaster (Spach)" . . . . "*Apterocaryon (Opiz)" . . . . . "Birch is a thinleaved deciduous hardwood tree of the genus Betula (/\u02C8b\u025Btj\u028Al\u0259/), in the family Betulaceae, which also includes alders, hazels, and hornbeams, and is closely related to the beech/oak family, Fagaceae. The genus Betula contains 30 to 60 known taxa of which 11 are on the IUCN 2011 Green List of Threatened Species. They are typically rather short-lived pioneer species widespread in the Northern Hemisphere, particularly in northern temperate and boreal climates."@en . "*Chamaebetula (Opiz)" . "Birch"@en . . .