Which plants have a pronounced ecological diversity?

Most often, ecological diversity is expressed in those plants that float on the surface of the water. For example: Pistia (water lettuce) is most often distributed in the subtropics and tropics, not cold hardy, one of the largest plants that floats on the surface of the water; Water hyacinth lives mainly in the tropical regions of America, covers the area of ​​reservoirs with a dense carpet layer about half a meter deep; Duckweed floating plants on the surface of stagnant waters, freshwater and not picky to different climatic conditions.