Also called bat nut, buffalo nut, devil pod, lin kok, ling kio nut, ling nut and singhara.  Part of water caltrop  genus Trapa and family Lythraceae.

An annual ♒︎ aquatic plant.  Native to Eurasia and Africa.  Invasive > learn+quiz Invasive > Global Invasive > in USA+Canada Invasive > report it! Invasive > in USA Invasive > in Michigan

Learn more about water-chestnut Trapa natans

Biological Control in Eastern USA (.pdf page 41)

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