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Plant Form: Floating perennial aquatic herb.
Size: Up to 1.5 m long.
Stem: Grow out of water with a spongy covering between the nodes when emergent from water.
Leaves: 8-20 pairs of elongated oval shaped leaflets per leaf, which close when touched.
Flowers: Yellow, ball shaped, up to 1.5 cm wide in clusters of 20-50 per flower spike.
Fruit and Seeds: Up to 3 cm long pods with up to 8 brown seeds.
Habitat: Ponds, swamps, canals.
Distinguishing Features: Similar appearance to Mimosa species, but is aquatic. Lack of glandular stamens distinguishes from another Water mimosa species (Neptunia plena).