Marsh grass is a type of wetland vegetation that is found in many parts of the world. It is composed of two main types of plants, SEDGE and REED. SEDGE is a grass-like plant with triangular stems and sharp-edged leaves, while REED is a tall, slender grass with hollow stems. Both SEDGE and REED are important components of marsh grass ecosystems, providing food and shelter for wildlife and helping to protect shorelines from erosion.