Sagittaria sagittifolia · strėlialapė papliauška

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DE · Gewöhnliches Pfeilkraut
LT · strėlialapė papliauška
LV · parastā bultene
PL · strzałka wodna

https://en.wikipedia.org/wiki/Sagittaria_sagittifolia
The round tuber is edible. It tastes bland, with a starchy texture, similar to a potato but somewhat crunchier, even when cooked. It is even cultivated as a food crop in China, Japan.
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