#quillwort  any of several spore-bearing aquatic or marsh plants having short rhizomes and leaves resembling quills; worldwide except Polynesia
  supertype:  fern_ally  pteridophytes of other classes than Filicopsida
  member of:  genus_Isoetes__Isoetes  type and genus of the Isoetaceae and sole extant genus of the order Isoetales
     member of:  family_Isoetaceae__Isoetaceae__quillwort_family__quillwortfamily  quillworts; coextensive with the genus Isoetes
        member of:  order_Isoetales__Isoetales  aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales
           member of:  class_Lycopsida__Lycopsida__Lycopodiate__class_Lycopodiate  club mosses and related forms: includes Lycopodiales; Isoetales; Selaginellales; and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta
              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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