What is "water shamrock"

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.

n. 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: buckbean, bogbean, bog myrtle, marsh trefoil, Menyanthes trifoliata]