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Nutmeg is the seed or ground spice of several species of the genus "Myristica". "Myristica fragrans" (fragrant nutmeg or true nutmeg) is a dark-leaved evergreen tree cultivated for two spices derived from its fruit: nutmeg, from its seed, and mace, from the seed covering. It is also a commercial source of an essential oil and nutmeg butter. The California nutmeg, "Torreya californica", has a seed of similar appearance, but is not closely related to "Myristica fragans", and is not used as a spice. If consumed in amounts exceeding its typical use as a spice, nutmeg powder may produce allergic reactions, cause contact dermatitis, or have psychoactive effects. Although used in traditional medicine for treating various disorders, nutmeg has no known medicinal value. 
Myristica fragrans