is a specific kind of: hamamelid dicot genus.

has as a member: chestnut, chestnut tree | American chestnut, American sweet chestnut, Castanea dentata | Castanea mollissima, Chinese chestnut | Castanea crenata, Japanese chestnut | Allegheny chinkapin, Castanea pumila, chinquapin, dwarf chestnut, eastern chinquapin | Castanea ozarkensis, chinquapin, Ozark chinkapin, Ozark chinquapin.

is a member of: beech family, Fagaceae, family Fagaceae.