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Plant Form: Mat forming aquatic herb.
Size: Can reach 4.5 m deep.
Leaves: Submerged leaves feather like in whorls around stem. Surface leaves 2-3 cm long in rosette in oval, triangle or rectangle shape with saw-toothed edges.
Flowers: White with 4 petals, above surface.
Fruit and Seeds: Hard, woody or bony nut, 3 cm wide with sharp spines.
Habitat: Dams, ponds and lakes.