Plants of the Four Corners

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  Plantae

      Tracheophyta

            Magnoliopsida

                    Fagales

                            Betulaceae

                                     Alnus

                                             Alnus acuminata

                                             Alnus alnobetula

                                               Alnus alnobetula subsp. alnobetula

                                                     [Alnus viridis]

                                               Alnus alnobetula subsp. crispa

                                                     [Alnus crispa]

                                                     [Alnus viridis subsp. crispa]

                                               Alnus alnobetula subsp. sinuata

                                                     [Alnus sinuata]

                                                     [Alnus viridis subsp. sinuata]

                                             Alnus glutinosa

                                                   [Betula glutinosa]

                                             Alnus incana

                                               Alnus incana subsp. incana

                                                     [Alnus tenuifolia f. incisa]

                                               Alnus incana subsp. rugosa

                                                     [Alnus rugosa]

                                               Alnus incana subsp. tenuifolia

                                                     [Alnus incana var. occidentalis]

                                                     [Alnus incana var. virescens]

                                                     [Alnus tenuifolia]

                                             Alnus maritima

                                             Alnus oblongifolia

                                             Alnus rhombifolia

                                             Alnus serrulata

                                     Betula

                                             Betula alleghaniensis

                                                   [Betula lutea]

                                             Betula glandulosa

                                             Betula lenta

                                                   Betula lenta f. uber

                                                         [Betula uber]

                                             Betula nana

                                             Betula nigra

                                             Betula occidentalis

                                                   [Betula fontinalis]

                                             Betula papyrifera

                                                   [Betula papyrifera var. commutata]

                                             Betula pendula

                                               Betula pendula subsp. mandshurica

                                                     [Betula japonica var. mandshurica]

                                                     [Betula mandshurica]

                                               Betula pendula subsp. pendula

                                                     [Betula montana]

                                                     [Betula pendula var. gracilis]

                                             Betula populifolia

                                             Betula pubescens

                                               Betula pubescens var. pubescens

                                                     [Betula alba]

                                             Betula pumila

                                                   [Betula glandulifera]

                                             Betula ×eastwoodiae

                                             Betula ×purpusii

                                                   [Betula ×murrayana]

                                             Betula ×utahensis

                                                   [Betula ×andrewsii]

                                                   [Betula ×piperi]

                                     Carpinus

                                             Carpinus betulus

                                             Carpinus caroliniana

                                               Carpinus caroliniana subsp. virginiana

                                     Corylus

                                             Corylus americana

                                             Corylus avellana

                                             Corylus cornuta

                                               Corylus cornuta subsp. californica

                                               Corylus cornuta subsp. cornuta

                                                     [Corylus rostrata]

                                             Corylus maxima

                                                   [Corylus maxima var. purpurea]

                                     Ostrya

                                             Ostrya knowltonii

                                                   [Ostrya chisosensis]

                                             Ostrya virginiana

                                               Ostrya virginiana subsp. virginiana

                                                     [Ostrya baileyi]