is a specific kind of: hamamelid dicot genus.

has as a member: birch, birch tree | Betula alleghaniensis, Betula leutea, yellow birch | American white birch, Betula cordifolia, Betula papyrifera, canoe birch, paper birch, paperbark birch | American gray birch, American grey birch, Betula populifolia, gray birch, grey birch | Betula pendula, common birch, European white birch, silver birch | Betula pubescens, downy birch, white birch | Betula nigra, black birch, red birch, river birch | Betula lenta, black birch, cherry birch, sweet birch | Betula neoalaskana, Yukon white birch | Betula fontinalis, mountain birch, swamp birch, water birch, Western birch, Western paper birch | American dwarf birch, Betula glandulosa, Newfoundland dwarf birch ... show more.

is a member of: Betulaceae, birch family, family Betulaceae.