Lemnaceae is a family of flowering plants, also known as the duckweed family, as it contains the duckweeds or water lentils. The duckweeds are now known to be a branch of the arum or aroid family (Araceae), so the name 'Lemnaceae' is rapidly falling out of use among botanists. These plants are very simple, lacking an obvious stem or leaves, but consist of a small 'thalloid' or plate-like structure that floats on or just under the water surface, with or without simple rootlets. The plants have b… (More on Duckweed)