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Organism
  Plantae
      Tracheophyta
            Liliopsida
                    Dioscoreales
                            Dioscoreaceae
                                     Dioscorea
                                             Dioscorea alata
                                             Dioscorea bulbifera
                                             Dioscorea cayenensis
                                                   [Dioscorea cayennensis]
                                               Dioscorea cayenensis subsp. rotundata
                                                     [Dioscorea rotundata]
                                             Dioscorea cordata
                                                   [Rajania cordata]
                                             Dioscorea esculenta
                                             Dioscorea floridana
                                                   [Dioscorea villosa var. floridana]
                                             Dioscorea glauca
                                             Dioscorea microflora
                                             Dioscorea oppositifolia
                                                   [Dioscorea batatas]
                                             Dioscorea pentaphylla
                                             Dioscorea pilosiuscula
                                             Dioscorea polygonoides
                                             Dioscorea polystachya
                                                   [Dioscorea batatas]
                                             Dioscorea sansibarensis
                                             Dioscorea trifida
                                             Dioscorea villosa
                                                   [Dioscorea hirticaulis]
                                                   [Dioscorea quaternata var. glauca]
                                                   [Dioscorea quaternata]
                                                   [Dioscorea villosa var. glabrifolia]
                                                   [Dioscorea villosa var. hirticaulis]
                                     Rajania
                                     Ramischia
                                     Ramium
                                     Tacca
                                             Tacca leontopetaloides
                                                   [Tacca involucrata]
                                                   [Tacca pinnatifida]