#class_Sphenopsida__Sphenopsida__Equisetatae__class_Equisetatae  horsetails and related forms
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member of:  division_Pteridophyta
  member:  order_Equisetales__Equisetales  lower tracheophytes in existence since the Devonian
     member:  family_Equisetaceae__Equisetaceae__horsetail_family__horsetailfamily  sole surviving family of the Equisetales: fern allies
        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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