#genus_Marsilea__Marsilea  clover ferns
  supertype:  fern_genus  genera of ferns and fern allies
  member of:  family_Marsileaceae
  member:  clover_fern__pepperwort  any of several water ferns of the genus Marsilea having four leaflets
  member:  water_clover__waterclover__Marsilea_quadrifolia  water fern of Europe and Asia and the eastern United States distinguished by four leaflets resembling clover leaves

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