water shamrock n 1: perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface [syn: {water shamrock}, {buckbean}, {bogbean}, {bog myrtle}, {marsh trefoil}, {Menyanthes trifoliata}]
bogbean \bogbean\ n. a perennial plant of Europe and America ({Menyanthes trifoliata}) having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at the water margin and spreading across the surface; -- called also {bog myrtle}, {water shamrock} and {marsh trefoil}. Syn: water shamrock, buckbean, bog myrtle, marsh trefoil. [WordNet 1.5]