American water plant that has became a troublesome water weed in India is

American water plant that has become a troublesome water weed in India is Eichhornia crassipes.
It is an aquatic plant native to South America, naturalized throughout the world, and often invasive outside its native range.
Water hyacinth is a free-floating perennial aquatic plant native to tropical and subtropical South America. With broad, thick, glossy, ovate leaves, water hyacinth may rise above the surface of the water as much as 1 m in height.
It is known as the "terror of Bengal" due to its invasive growth tendencies.