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Organism
  Plantae
      Tracheophyta
            Magnoliopsida
                    Fagales
                            Betulaceae
                                     Alnus
                                             Alnus alnobetula
                                               Alnus alnobetula subsp. alnobetula
                                                     [Alnus viridis]
                                                     [Duschekia viridis]
                                               Alnus alnobetula subsp. crispa
                                                     [Alnus crispa var. elongata]
                                                     [Alnus crispa var. mollis]
                                                     [Alnus crispa]
                                                     [Alnus viridis subsp. crispa]
                                                     [Alnus viridis var. crispa]
                                               Alnus alnobetula subsp. fruticosa
                                                     [Alnus viridis subsp. fruticosa]
                                               Alnus alnobetula subsp. sinuata
                                                     [Alnus crispa subsp. sinuata]
                                                     [Alnus crispa var. laciniata]
                                                     [Alnus sinuata]
                                                     [Alnus viridis subsp. sinuata]
                                                     [Alnus viridis var. sinuata]
                                                     [Duschekia sinuata]
                                             Alnus cordata
                                             Alnus fallacina
                                             Alnus glutinosa
                                                   [Alnus alnus]
                                             Alnus incana
                                               Alnus incana subsp. incana
                                                     [Alnus alnus]
                                                     [Alnus incana var. virescens]
                                               Alnus incana subsp. rugosa
                                                     [Alnus incana var. americana]
                                                     [Alnus rugosa var. americana]
                                                     [Alnus rugosa]
                                               Alnus incana subsp. tenuifolia
                                                     [Alnus incana var. occidentalis]
                                                     [Alnus incana var. virescens]
                                                     [Alnus purpusii]
                                                     [Alnus tenuifolia]
                                             Alnus maritima
                                                   [Alnus maritima subsp. metoporina]
                                                   [Alnus maritima var. metoporina]
                                                   [Alnus metoporina]
                                                   [Betula-alnus maritima]
                                             Alnus nepalensis
                                             Alnus oblongifolia
                                             Alnus rhombifolia
                                                   [Alnus rhombifolia var. bernardina]
                                             Alnus rubra
                                                   [Alnus oregona var. pinnatisecta]
                                                   [Alnus oregona]
                                             Alnus serrulata
                                                   [Alnus incana var. serrulata]
                                                   [Alnus noveboracensis]
                                                   [Alnus serrulata var. subelliptica]
                                               Frangula alnus subsp. alnus
                                                     [Rhamnus frangula var. angustifolia]
                                                     [Rhamnus frangula]
                                     Betula
                                             Betula alleghaniensis
                                                   [Betula alleghaniensis var. fallax]
                                                   [Betula alleghaniensis var. macrolepis]
                                               Betula alleghaniensis var. alleghaniensis
                                                     [Betula alleghaniensis var. fallax]
                                                     [Betula lutea var. fallax]
                                                     [Betula lutea]
                                             Betula caerulea
                                               Betula caerulea var. caerulea
                                               Betula caerulea var. grandis
                                                     [Betula caerulea-grandis]
                                             Betula cordifolia
                                                   [Betula alba var. cordifolia]
                                                   [Betula papyrifera var. cordifolia]
                                             Betula dugleana
                                             Betula eastwoodiae
                                                   [Betula arbuscula]
                                             Betula glandulosa
                                                   [Betula exilis]
                                                   [Betula glandulosa var. sibirica]
                                                   [Betula glandulosa/nana]
                                                   [Betula nana subsp. exilis]
                                                   [Betula nana var. sibirica]
                                             Betula hornei
                                                   [Betula ungavensis]
                                             Betula jackii
                                             Betula lenta
                                               Betula lenta f. uber
                                                     [Betula lenta subsp. uber]
                                                     [Betula lenta var. uber]
                                                     [Betula uber]
                                             Betula minor
                                                   [Betula papyrifera var. minor]
                                                   [Betula saxophila]
                                             Betula nana
                                                   [Betula glandulosa/nana]
                                             Betula nigra
                                             Betula occidentalis
                                                   [Betula beeniana]
                                                   [Betula fontinalis]
                                                   [Betula occidentalis var. inopina]
                                                   [Betula papyrifera subsp. occidentalis]
                                                   [Betula papyrifera var. occidentalis]
                                             Betula papyrifera
                                                   [Betula alba var. commutata]
                                                   [Betula kenaica]
                                                   [Betula neoalaskana var. kenaica]
                                                   [Betula papyrifera var. commutata]
                                                   [Betula papyrifera var. elobata]
                                                   [Betula papyrifera var. kenaica]
                                                   [Betula papyrifera var. macrostachya]
                                                   [Betula papyrifera var. pensilis]
                                                   [Betula papyrifera var. subcordata]
                                               Betula papyrifera var. papyrifera
                                                     [Betula alba var. commutata]
                                                     [Betula papyrifera var. commutata]
                                                     [Betula papyrifera var. elobata]
                                                     [Betula papyrifera var. macrostachya]
                                                     [Betula papyrifera var. pensilis]
                                             Betula pendula
                                                   [Betula pendula f. dalecarlica]
                                                   [Betula verrucosa]
                                               Betula pendula subsp. mandshurica
                                                     [Betula alaskana]
                                                     [Betula mandshurica]
                                                     [Betula neoalaskana]
                                                     [Betula papyrifera subsp. humilis]
                                                     [Betula papyrifera var. humilis]
                                                     [Betula papyrifera var. neoalaskana]
                                                     [Betula platyphylla var. platyphylla]
                                                     [Betula platyphylla]
                                                     [Betula resinifera]
                                               Betula pendula subsp. pendula
                                                     [Betula pendula f. dalecarlica]
                                                     [Betula verrucosa]
                                               Betula pendula subsp. szechuanica
                                                     [Betula mandshurica var. szechuanica]
                                                     [Betula platyphylla var. szechuanica]
                                                     [Betula szechuanica]
                                             Betula populifolia
                                             Betula pubescens
                                               Betula pubescens subsp. pubescens
                                                     [Betula alba]
                                               Betula pubescens var. pubescens
                                                     [Betula alba]
                                               Betula pubescens var. pumila
                                                     [Betula borealis]
                                                     [Betula pubescens subsp. borealis]
                                             Betula pumila
                                                   [Betula glandulifera]
                                                   [Betula glandulosa var. glandulifera]
                                                   [Betula glandulosa var. hallii]
                                                   [Betula nana var. glandulifera]
                                                   [Betula nana var. renifolia]
                                                   [Betula pumila var. glabra]
                                                   [Betula pumila var. glandulifera]
                                                   [Betula pumila var. renifolia]
                                               Betula pumila var. pumila
                                             Betula purpusii
                                                   [Betula murrayana]
                                             Betula sandbergii
                                             Betula sargentii
                                             Betula utahensis
                                                   [Betula andrewsii]
                                                   [Betula commixta]
                                                   [Betula occidentalis var. fecunda]
                                                   [Betula papyrifera var. subcordata]
                                                   [Betula piperi]
                                             Betula utilis
                                               Betula utilis subsp. jacquemontii
                                             Betula winteri
                                     Betula-alnus
                                     Biancaea
                                     Bicuculla
                                     Carpinus
                                             Carpinus betulus
                                             Carpinus caroliniana
                                               Carpinus caroliniana subsp. caroliniana
                                                     [Carpinus americana]
                                               Carpinus caroliniana subsp. virginiana
                                                     [Carpinus betulus var. virginiana]
                                                     [Carpinus caroliniana var. virginiana]
                                             Carpinus turczaninovii
                                                   [Carpinus coreana]
                                     Corylus
                                             Corylus americana
                                                   [Corylus americana var. indehiscens]
                                             Corylus avellana
                                             Corylus cornuta
                                               Corylus cornuta subsp. californica
                                                     [Corylus californica]
                                                     [Corylus cornuta var. californica]
                                                     [Corylus cornuta var. glandulosa]
                                               Corylus cornuta subsp. cornuta
                                                     [Corylus rostrata]
                                               Corylus cornuta var. cornuta
                                                     [Corylus rostrata]
                                             Corylus heterophylla
                                     Ostrya
                                             Ostrya knowltonii
                                                   [Ostrya chisosensis]
                                                   [Ostrya knowltonii var. chisosensis]
                                             Ostrya virginiana
                                                   [Ostrya virginiana var. lasia]
                                               Ostrya virginiana subsp. virginiana
                                                     [Ostrya virginiana var. lasia]
                                               Ostrya virginiana var. virginiana
                                     Othake
                                     Othocallis
                                     Otophylla