The involucre may be scaly, spiny, leafy or tubular, depending on the species of nut. Nuts may be contained in an involucre, a cup-shaped structure formed from the flower bracts. Botanically, a nut is a fruit with a woody pericarp developing from a syncarpous gynoecium. Botanical definition Ī seed is the mature fertilised ovule of a plant it consists of three parts, the embryo which will develop into a new plant, stored food for the embryo, and a protective seed coat. Nuts are an energy-dense and nutrient-rich food source. Common usage of the term often refers to any hard-walled, edible kernel as a nut. The general and original usage of the term is less restrictive, and many nuts (in the culinary sense), such as almonds, pistachios, and Brazil nuts, are not nuts in a botanical sense. Most seeds come from fruits that naturally free themselves from the shell, but this is not the case in nuts such as hazelnuts, chestnuts, and acorns, which have hard shell walls and originate from a compound ovary. In general usage and in a culinary sense, a wide variety of dry seeds are called nuts, but in a botanical context "nut" implies that the shell does not open to release the seed ( indehiscent). Some common "culinary nuts": hazelnuts, which are also botanical nuts Brazil nuts, which are not botanical nuts, but rather the seeds of a capsule and walnuts, pecans, and almonds (which are not botanical nuts, but rather the seeds of drupes)Ī nut is a fruit consisting of a hard or tough nutshell protecting a kernel which is usually edible.
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