Wolffiella is a genus of aquatic plants commonly called duckweeds in the family Araceae. Common names for plants in this genus include bogmat and mud-midget.USDA Plants ProfileJepson Manual: Wolffiella They are rootless and have a keel that allows them to maintain their orientation in the water. They are small, measuring to in width.
Selected species Wolffiella caudata Wolffiella denticulata Wolffiella gladiata Wolffiella hyalina Wolffiella lingulata Wolffiella neotropica Wolffiella oblonga Wolffiella repanda Wolffiella rotunda Wolffiella welwitschii
References
Further reading Bown, Deni (2000). Aroids: Plants of the Arum Family. Timber Press. .