Common Wolffia, also known as Wolffia arrhiza, is a type of aquatic plant that belongs to the duckweed family. Although common wolffia is its most popular name, it has other synonyms. For instance, it is also known as the Asian watermeal, the rootless duckweed, the spotless watermeal, and the least duckweed. These synonyms describe its characteristic features, such as the lack of roots, small size, and absence of distinctive spots. Common Wolffia is popular in aquariums and water gardens due to its ease of maintenance, but it is also considered a nuisance weed in some regions because it can cover large water bodies quickly and disrupt natural ecosystems.