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From Citizendium, the Citizens' Compendium

Water chestnut is a term used for three different plants and their fruits, for their resemblance to chestnuts:

• Trapa natans, also called water caltrop, native to central Europe, the Nile Valley, and western Asia.
• Eleocharis tuberosus, the Chinese water chestnut.
• Pachira aquatica, a native of the tropical Americas.