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Eukaryota
  Plantae
    Embryophyta
      Polypodiophyta
            Polypodiopsida
                    Osmundales
                            Osmundaceae
                                     Aphyllocalpa
                                     Osmunda
                                             Osmunda regalis
                                                   [Aphyllocalpa regalis]
                                                   [Osmunda capensis]
                                                   [Osmunda hilsenbergii]
                                                   [Osmunda obtusifolia]
                                                   [Osmunda plumierii]
                                                   [Osmunda regalis var. abyssinica]
                                                   [Osmunda regalis var. brevifolia]
                                                   [Osmunda regalis var. capensis]
                                                   [Osmunda regalis var. obtusifolia]
                                                   [Osmunda regalis var. plumieri]
                                                   [Osmunda schelpei]
                                                   [Osmunda spectabilis]
                                                   [Osmunda transvaalensis]
                                                   [Struthiopteris regalis]
                                     Todea
                                             Todea barbara
                                                   [Acrostichum barbarum]
                                                   [Osmunda barbara]
                                                   [Todea africana]