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CommentsTo some people, duckweed may appear to be some kind of algae, but they rank among the smallest of all flowering plants. The different species of duckweed are often difficult to distinguish from each other, and an instrument with 10x magnification or higher is often necessary to make a correct identification. Two other groups of similar-looking plants are the Wolffia (Watermeal) and Spirodela (Greater Duckweed). Like duckweed, these species are floating aquatics consisting of small individual thalli. However, species of Watermeal tend to be smaller in size and lack rootlets, while species of Greater Duckweed tend to be larger in size and have 2 or more rootlets per thallus. Another common name of Lemna minor is Lesser Duckweed.