Plant Form: Perennial semi-aquatic mat-forming herb.
Size: Up to 40 cm above water or mud surface.
Stem: Creep in mud forming thick masses.
Leaves: Circular to kidney shaped, dark green, with 3-11 deep or shallow lobes.
Flowers: Tiny greenish, yellowish or white with 5 petals, 2-3 mm diameter under leaves in umbrella shaped clusters.
Fruit and Seeds: Circular and flattened, greenish brown, 1-3 mm long and divided into 2 one-seeded sections.
Habitat: Wetlands, lakes, dams.
Distinguishing Features: Shiny leaf underside compared to lookalike Hydrocotyle bonariensis.
Impacts: Reduces water quality, outcompetes native vegetation, reduces habitat for native animals, and impacts water access.