#water_chestnut_plant__water_chestnut__waterchestnut__caltrop  a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
  supertype:  #aquatic_plant__aquaticplant__water_plant__waterplant__hydrophyte__hydrophytic_plant__hydrophyticplant  a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
  member of:  #genus_Trapa
  subtype:  #water_caltrop__watercaltrop__Jesuits'_nut__Trapa_natans  a variety of water chestnut
  subtype:  #ling_ko__ling__Trapa_bicornis  water chestnut whose spiny fruit has two rather than 4 prongs

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