From South America this invasive plant stands erect along the shoreline and forms long runners (up to 16 feet) that creep across wet soil or float across the water surface. Vine-like runners can rise 1-2′ above the surface and form roots that hang below the water.
Leaves can be green or reddish, willow-like on the erect stems to round or oval on the floating stems. In the summer months it blooms with a yellow flower.
Able to double its mass every 15 days and reproduce from fragmentation, roots and seed make this a highly invasive plant. Control is best during summer when the leaf mass above water is sufficient for maximum herbicide uptake.