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