#genus_Equisetum__Equisetum  horsetails; coextensive with the family Equisetaceae
  supertype:  fern_genus  genera of ferns and fern allies
  member of:  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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