#family_Equisetaceae__Equisetaceae__horsetail_family__horsetailfamily  sole surviving family of the Equisetales: fern allies
  supertype:  fern_family  families of ferns and fern allies
  member of:  order_Equisetales
  member:  genus_Equisetum__Equisetum  horsetails; coextensive with the family Equisetaceae
     member:  horsetail  perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America

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