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Sagittaria sagittifolia · strėlialapė papliauška

EN · arrowhead 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.