Central Taxonomic Thesaurus
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  Plantae
    Tracheophyta
           [Tracheobionta]
      Pteridophyta
            Polypodiopsida
                    Polypodiales
                            Onocleaceae
                                     Matteuccia
                                             Matteuccia intermedia
                                             Matteuccia pensylvanica
                                             Matteuccia struthiopteris
                                                   [Struthiopteris germanica]
                                               Matteuccia struthiopteris subsp. struthiopteris
                                               Matteuccia struthiopteris var. pensylvanica
                                               Matteuccia struthiopteris var. pubescens
                                               Matteuccia struthiopteris var. struthiopteris
                                     Onoclea
                                             Onoclea hintonii
                                             Onoclea orientalis
                                                   [Matteuccia orientalis]
                                                   [Pentarhizidium orientale]
                                             Onoclea sensibilis
                                                   [Onoclea sensibilis f. obtusilobata]
                                                   [Onoclea sensibilis f. ventroperaferens]
                                                   Onoclea sensibilis f. sensibilis
                                               Onoclea sensibilis var. genuina
                                               Onoclea sensibilis var. interrupta
                                               Onoclea sensibilis var. obtusilobata
                                               Onoclea sensibilis var. sensibilis
                                             Onoclea struthiopteris
                                               Onoclea struthiopteris var. pensylvanica
                                     Onocleopsis
                                             Onocleopsis hintonii
                                     Pentarhizidium
                                             Pentarhizidium intermedium
                                     Pteretis
                                             Pteretis nodulosa
                                             Pteretis pensylvanica
                                             Pteretis struthiopteris