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Plant Form: Annual mat-forming aquatic herb.
Size: Up to 1.5 m deep rooted.
Stem: Long, submerged.
Leaves: Submerged leaves are feather-like in whorls, surface leaves are in rosette, glossy on top and 2-3 cm long. Oval, triangle or diamond shaped, on stalks with a swollen round bulge.
Flowers: Above water. White with four petals, 8 mm long.
Fruit and Seeds: Hard woody nut with sharp spines, about 3 cm across, with one seed. Underneath the emerged leaves.
Habitat: Ponds, lakes, dams, reservoirs, mudflats.
Distinguishing Features: Swollen bulge on leaf stalks distinguish from lookalike Mosaic flower (Ludwigia sedioides).