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 husks are produced from the exocarp tissue of the flower, while the part known as the nut develops from the endocarp and contains the seed. The husk itself is aeneous, oval to oblong, 2.6–6 cm long and 1.5–3 cm broad. The outer husk is 3–4 mm thick, starts out green and turns brown at maturity, at which time it splits off in four sections to release the thin-shelled nut.
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