#class_Sphenopsida__Sphenopsida__Equisetatae__class_Equisetatae  horsetails and related forms
  supertype:  class__clas  (biology) a taxonomic group containing one or more orders
  member:  order_Equisetales
  member of:  division_Pteridophyta__Pteridophyta  containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta
     member of:  kingdom_Plantae__Plantae__plant_kingdom__plantkingdom  taxonomic kingdom comprising all living or extinct plants

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