Carya Nutt. is one of nine genera that comprise the Juglandaceae (Stone 1997). This small family of deciduous trees includes such well-known members as Juglans or walnuts, Carya the hickories and Pterocarya the wing-nuts. They occur in the Western Hemisphere and Eurasia. Stevens (2006) places Juglandaceae within the Fagales and closely related to Myricaceae and Rhoipteleaceae.