water clover

water clover

noun
a common freshwater fern, Marsilea quadrifolia, of lake edges and quiet ponds, having roots embedded in the bottom, very slender and often tangled stems, and floating, cloverlike leaves composed of four leaflets.
Also called pepperwort, water shamrock.
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WordNet
water clover

noun
water fern of Europe and Asia and the eastern United States distinguished by four leaflets resembling clover leaves 
WordNet® 3.0, © 2006 by Princeton University.
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