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Related to Marsilea: Marsilea quadrifolia
a genus of plants of the family Marsiliaceae of the class Filicineae. They are rhizomatous grasses growing usually in shallow water or wet, marshy areas that occasionaly dry up. Numerous roots grow below the rhizome, and two rows of leaves form on top. The young leaves are spirally convolute; the more developed leaves have four approximate pinnae on a long stem. There are between 60 and 70 species found throughout the world, particularly in Australia and southern Africa. Three species are found in the USSR, growing in the Lower Volga Region, the Caucasus, and Middle Asia. The most common is the clover fern Marsilea quadrifolia.