The pignut hickory (Carya glabra) belongs to Juglandaceae (the Walnut family). It is a tall deciduous tree that is native to the eastern United States and Canada. This tree grows in dry ridgetops and sides or slopes of mountains, and typically up to a height of 15-24 m. The bark is gray and develops scaly ridges as it matures. The leaves are odd-pinnate compound, dark yellowish-green, with 5-7, toothed, ovate-lanceolate leaflets. They turn yellow in fall. The yellowish-green flowers bloom in April to May, with the male flowers in drooping catkins and the female flowers on short spikes. The fruit is a nut, usually bitter and unpalatable to humans, some mammals eat it.