This is the rhombus, an aquatic plant. Also known as "rhododendron". It is a seed plant. The southern provinces of China are cultivated or wild. Its flesh is edible, young stems can be used as vegetables, fruit has a sharp horn, commonly known as the rhombus. Growing in the lake, the rhombus vine long green leaves, the shape of the leaves is diamond-shaped, so the fruit is called rhombus horn child. The stems are purplish red with small bright yellow flowers. Rhombus is an annual herbaceous aquatic plant, also known as the "water drop flower", the fruit "rhombus" for the nut.

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