Plants of the Four Corners

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  Plantae
      Tracheophyta
            Magnoliopsida
                    Malpighiales
                            Violaceae
                              Violoideae
                                     Hybanthus
                                     Isodendrion
                                             Isodendrion hosakae
                                             Isodendrion laurifolium
                                             Isodendrion longifolium
                                             Isodendrion pyrifolium
                                     Pombalia
                                             Pombalia attenuata
                                                   [Hybanthus attenuatus]
                                                   [Ionidium riparium var. aestivum]
                                                   [Ionidium riparium]
                                             Pombalia verticillata
                                                   [Hybanthus linearis]
                                                   [Hybanthus verticillatus]
                                                   [Ionidium lineare]
                                     Viola
                                             Viola adunca
                                                   [Viola adunca f. glabra]
                                                   [Viola adunca var. cascadensis]
                                                   [Viola demissa]
                                                   [Viola inamoena]
                                                   [Viola mamillata]
                                                   [Viola montanensis]
                                                   [Viola retroscabra]
                                                   [Viola subvestita]
                                               Viola adunca var. bellidifolia
                                                     [Viola bellidifolia]
                                             Viola affinis
                                                   [Viola sororia subsp. affinis]
                                                   [Viola sororia var. affinis]
                                             Viola arvensis
                                             Viola aurea
                                               Viola aurea subsp. arizonensis
                                               Viola aurea subsp. mohavensis
                                                     [Viola purpurea subsp. mohavensis]
                                             Viola beckwithii
                                                   [Viola beckwithii var. cachensis]
                                             Viola biflora
                                             Viola blanda
                                                   [Viola blanda var. palustriformis]
                                             Viola brevipes
                                                   [Viola palustris subsp. brevipes]
                                                   [Viola palustris var. brevipes]
                                             Viola calcicola
                                             Viola canadensis
                                                   [Viola canadensis subsp. rydbergii]
                                                   [Viola canadensis var. neomexicana]
                                                   [Viola canadensis var. rydbergii]
                                                   [Viola canadensis var. scariosa]
                                                   [Viola neomexicana]
                                                   [Viola rydbergii]
                                             Viola canina
                                             Viola chamissoniana
                                             Viola charlestonensis
                                                   [Viola purpurea var. charlestonensis]
                                             Viola clauseniana
                                             Viola cucullata
                                                   [Viola obliqua]
                                             Viola douglasii
                                             Viola epipsila
                                               Viola epipsila subsp. repens
                                             Viola frank-smithii
                                             Viola grahamii
                                                   [Viola reptans]
                                             Viola kitaibeliana
                                             Viola labradorica
                                                   [Viola canina var. muhlenbergii]
                                                   [Viola muhlenbergii var. pubescens]
                                             Viola lanaiensis
                                             Viola lithion
                                             Viola macloskeyi
                                             Viola maculata
                                                   [Viola macloviana]
                                             Viola missouriensis
                                                   [Viola sororia var. missouriensis]
                                             Viola nephrophylla
                                                   [Viola arizonica]
                                                   [Viola cognata]
                                                   [Viola nepetifolia]
                                                   [Viola nephrophylla var. arizonica]
                                             Viola nuttallii
                                             Viola oahuensis
                                             Viola odorata
                                             Viola orbiculata
                                             Viola palmata
                                             Viola palustris
                                                   [Viola macloskeyi subsp. pallens]
                                                   [Viola macloskeyi var. pallens]
                                                   [Viola pallens]
                                             Viola pedatifida
                                             Viola praemorsa
                                               Viola praemorsa subsp. linguifolia
                                                     [Viola erectifolia]
                                                     [Viola gomphopetala]
                                                     [Viola linguifolia]
                                                     [Viola nuttallii var. linguifolia]
                                                     [Viola praemorsa var. altior]
                                                     [Viola praemorsa var. linguifolia]
                                               Viola praemorsa subsp. praemorsa
                                                     [Viola nuttallii var. praemorsa]
                                             Viola pratincola
                                             Viola primulifolia
                                             Viola purpurea
                                               Viola purpurea subsp. dimorpha
                                               Viola purpurea var. dimorpha
                                                     [Viola nuttallii var. venosa]
                                                     [Viola purpurea subsp. venosa]
                                             Viola rafinesquei
                                                   [Viola bicolor]
                                                   [Viola kitaibeliana var. rafinesquei]
                                             Viola renifolia
                                                   [Viola renifolia var. brainerdii]
                                             Viola retusa
                                             Viola rugosa
                                             Viola rugulosa
                                                   [Viola canadensis var. rugulosa]
                                             Viola scopulorum
                                                   [Viola canadensis subsp. scopulorum]
                                                   [Viola canadensis var. scopulorum]
                                             Viola selkirkii
                                             Viola sheltonii
                                                   [Viola biternata]
                                             Viola sororia
                                                   [Viola papilionacea]
                                             Viola subsinuata
                                             Viola tomentosa
                                             Viola tricolor
                                             Viola umbraticola
                                               Viola umbraticola var. glaberrima
                                             Viola utahensis
                                             Viola vallicola
                                                   [Viola nuttallii subsp. vallicola]
                                                   [Viola nuttallii var. vallicola]
                                                   [Viola physalodes]
                                               Viola vallicola var. major
                                                     [Viola nuttallii var. major]
                                                     [Viola praemorsa subsp. major]
                                                     [Viola praemorsa var. major]
                                             Viola ×chrysantha