menyanthes : Idioms & Phrases
genus menyanthes
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noun the type genus of the Menyanthaceae; one species: bogbeans
Menyanthes.
WordNet
menyanthes trifoliata
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noun 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
marsh trefoil; buckbean; bogbean; water shamrock; bog myrtle.