Lesser duckweed is a term used to describe a water plant that is often found floating on the surface of ponds, lakes and rivers. Synonyms for this plant include water lentil, duckmeat, water velvet and common duckweed. The name "water lentil" refers to the plant's small, round leaves which resemble lentils. Duckmeat and water velvet are also descriptive of the plant's appearance, while common duckweed simply refers to the fact that it is a well-known and widespread aquatic plant species. Regardless of what it is called, lesser duckweed plays an important role in aquatic ecosystems as a food source for fish and waterfowl, as well as a filter for excess nutrients in the water.