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pepperwort  n 
1 any of various temperate and tropical aquatic or marsh ferns of the genus Marsilea, having floating leaves consisting of four leaflets: family Marsileaceae 
2 any of several cruciferous plants of the genus Lepidium, esp. L. campestre, of dry regions of Eurasia, having small white flowers and pungent seeds, (Usual U.S. and Canadian name)  peppergrass