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Four-leaf clover (Trifolium sp.). Clover plants are used in agriculture as hay or pasture plants. They are also used as soil enrichers. Four leaf clovers, which are far less common then three-leaf clovers, are seen as a sign of good luck in some cultures. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHR 366 CRISTINA PEDRAZZINI/SCIENCE PHOTO LIBRARY) === ===