shamrock : Idioms & Phrases
Index
shamrock pea
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noun trailing trifoliate Asiatic and African herb having cobalt blue flowers
Parochetus communis.
WordNet
water shamrock
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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; Menyanthes trifoliata; buckbean; bogbean; bog myrtle.