1911 Encyclopædia Britannica/Buck-Bean

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BUCK-BEAN, or Bog-Bean (Menyanthes trifoliata, a member of the Gentian family), a bog-plant with a creeping stem, alternately arranged large leaves each with three leaflets, and spikes of white or pink flowers. The stout stem is bitter and has tonic and febrifuge properties. The plant is widely distributed through the north temperate zone.