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Carya illinoinensis, commonly called the pecan, is a species of hickory native to Mexico and the south central and southeastern United States. The pecan tree is a large deciduous tree, growing to 20–40 m (66–131 ft) in height. A pecan, like the fruit of all other members of the hickory genus, is not truly a nut, but is technically a drupe, a fruit with a single stone or pit surrounded by a husk. The seeds of the pecan are edible with a rich, buttery flavor.

Before European settlement, pecans were widely consumed and traded by Native Americans. They can provide two to five times more calories per unit weight than wild game and require no preparation. As a wild forage, the fruit of the previous growing season is commonly still edible when found on the ground. Thomas Jefferson planted Carya illinoinensis, known as "Illinois nuts", in his nut orchard at Monticello in Virginia. George Washington reported in his journal that Jefferson had given him "Illinois nuts", which he then grew at Mount Vernon. (Read more...)