Trapa

Trapa

Trapa L.
Engl.: water chestnut.
Sven.: sjönöt.

Trapa natans

Trapa natans L.
Engl.: water chestnut, bull nut, European water chestnut, water nuts, waternut.
Deu.: Wassernuss.
Sven.: sjönöt.

I have no articles for this botanical term, but there might be some for the next level down (if found).