Trapa natans
PlantsFamily: Lythraceae · Genus: Trapa

Steve Hurst @ USDA-NRCS PLANTS Database · public_domain
About
Trapa natans, the water caltrop, is a widespread species of flowering plant in the genus Trapa, family Lythraceae, grown as a food crop. Other vernacular names include buffalo nut, bat nut, devil pod, ling nut, mustache nut, singhara nut, water nut, and water chestnut, though this last name is commonly applied to Eleocharis dulcis.
Summary from Wikipedia
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Growing details and traits for Trapa natans in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.