Spirodela polyrhiza

Spirodela polyrhiza (orth. var. S. polyrrhiza) is a species of duckweed known by the common names common duckmeat, greater duckweed, common duckweed, and duckmeat. It can be found nearly worldwide in many types of freshwater habitat. It is a perennial aquatic plant usually growing in dense colonies, forming a mat on the water surface. Each plant is a smooth, round, flat disc one half to one centimeter wide. It produces several minute roots. It also produces a pouch containing male and female flowers. The top part dies in the fall and the plant often overwinters as a turion. Spirodela polyrhiza is an ideal system for biofuels, bioremediation and carbon cycling due to their aspects of fast-growing, direct contact with media and smallest genome size (~150 Mb). A comprehensive genomic study of Spirodela polyrhiza was published in February 2014. The results provide insights into how this organism is adapted to rapid growth and an aquatic lifestyle. Recorded, as Lemna polyrhiza L. , as mainly in the south and east of the British Isles. In Ireland it is found in counties Down, Antrim and Londonderry.