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water shamrock, buckbean, bogbean, bog myrtle, marsh trefoil, Menyanthes trifoliata | perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; 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 ❲Menyanthes trifoliata❳ |