| Summary: | The Lemnaceae (or duckweeds) are a family of aquatic plants which float onor just below the surface of fresh waterbodies. All species of this family showextreme reduction in morphology and appear as small, generally adhering,pad-like fronds which may or may not be differentiated and may or may nothave roots (Daubs 1965; Stace 1991). Duckweeds are a very successful groupand are a common feature of many rivers, ditches, canals and still waterbodiesworld-wide, being unknown only from Antarctica, Iceland and Greenland(Landolt 1986). They can grow in great abundance, particularly under highnutrient conditions, and may completely cover the water surface of slowmovingor still waterbodies (De Groot et al. 1987).
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