Summary ¹

Spirodela polyrhiza (orth. var. S. polyrrhiza) is a species of duckweed known by the common names 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...

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1. (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Spirodela_polyrhiza

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