Sagittaria sagittifolia · strėlialapė papliauška

• arrowhead
• Gewöhnliches Pfeilkraut
• strėlialapė papliauška
• parastā bultene
• 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. 4018