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It is a gray tree of the walnut family, native exclusively to North America. Hickory is a large, strong tree, 18 to 24 m (60 to 80 ft) high, with close, shaggy bark. It has large pinnately divided leaves, pistillate and staminate flowers and drooping aments. The fruit is a thick-shelled nut in a tough, green husk. Various species are known: C. ovata, shagbark hickory, yielding sweeter and better nuts; C. laciniosa, kingnut or shellbark; C. tomentosa, mockernut, having tough wood; and C. glabra, pignut, having bitter, astringent nuts.

용도walnut oil is hydrating, toning, anti-inflammatory, nourishing, and emollient. Walnut oil can help maintain skin suppleness. Its constituents include vitamin e, oleic acid, linolenic acid, and a high percentage of linoleic acid (some sources cite up to 60 percent). Its application includes use in moisturizers, eye creams, and body oils.