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Family: Betulaceae
  Genus: Betula

    Betula alleghaniensis Britton*+

        yellow birch
             Betula alleghaniensis Britton var. alleghaniensis
             Betula alleghaniensis Britton var. fallax (Fassett) Brayshaw
             Betula alleghaniensis Britton var. macrolepis (Fernald) Brayshaw
             Betula lutea F.Michx.
             Betula lutea F.Michx. f. fallax Fassett
             Betula lutea F.Michx. var. macrolepis Fernald
             Betula purpusii C.K.Schneid. f. fallax (Fassett) B.Boivin
    Betula cordifolia Regel*+

        heart-leaf birch, mountain white birch
             Betula alba L. var. cordifolia (Regel) Regel
             Betula papyrifera Marshall var. cordifolia (Regel) Fernald
    Betula nigra L.*+

        black birch, red birch, river birch
             Betula rubra F.Michx.
    Betula papyrifera Marshall*+

        canoe birch, paper birch, white birch
             Betula alba L. var. elobata Fernald
             Betula alba L. var. papyrifera (Marshall) Spach
             Betula papyracea Aiton
             Betula papyrifera Marshall var. elobata (Fernald) Sarg.
             Betula papyrifera Marshall var. macrostachya Fernald
             Betula papyrifera Marshall var. papyrifera
             Betula papyrifera Marshall var. pensilis Fernald
             Betula papyrifera Marshall var. commutata (Regel) Fernald
             Betula papyrifera Marshall var. subcordata (Rydb.) Sarg.
             Betula subcordata Rydb.
    Betula pendula Roth*+

        European white birch, weeping birch
    Betula pendula Roth+

        
             Betula alba L. var. dalecarlica L.f.
             Betula pendula Roth f. dalecarlica (L.f.) C.K.Schneid.
             Betula pendula Roth var. dalecarlica (L.f.) Rehder
    Betula pendula Roth var. pendula +

        European white birch, weeping birch
             Betula verrucosa Ehrh.
    Betula populifolia Marshall
        gray birch, white birch
    Betula pumila L.*+

        bog birch, dwarf birch, swamp birch
             Betula borealis Spach
             Betula glandulifera (Regel) B.T.Butler
             Betula glandulosa Michx. var. glandulifera (Regel) Gleason
             Betula glandulosa Michx. var. hallii (T.J.Howell) C.L.Hitchc.
             Betula hallii T.J.Howell
             Betula nana L. var. glandulifera (Regel) B.Boivin
             Betula pubescens Ehrh. subsp. borealis
             Betula pumila L. var. glandulifera Regel
             Betula pumila L. var. glabra Regel
             Betula pumila L. var. pumila
             Betula pumila L. var. renifolia Fernald
    Betula X purpusii C.K.Schneid. X +

        Purpus' birch
    Betula X sandbergii Britton X *+

        Sandberg's birch
  Genus: Alnus

    Alnus glutinosa (L.) Gaertn.*+
        black alder, European alder
             Alnus alnus (L.) Britton
             Alnus vulgaris Hill
             Betula alnus L. var. glutinosa L.
    Alnus incana (L.) Moench subsp. rugosa*+
        mountain alder, speckled alder, swamp alder
             Alnus glauca Michx.
             Alnus incana (L.) Moench f. tomophylla Fernald
             Alnus incana (L.) Moench var. americana Regel
             Alnus rugosa (Du Roi) Spreng.
             Alnus rugosa (Du Roi) Spreng. var. americana (Regel) Fernald
             Alnus rugosa (Du Roi) Spreng. var. tomophylla (Fernald) Fernald
             Betula alnus L. var. rugosa Du Roi
    Alnus viridis (Vill.) DC. subsp. crispa*+
        American green alder, green alder, mountain alder
             Alnus alnobetula (Ehrh.) K.Koch var. crispa (Aiton) H.J.P.Winkler
             Alnus crispa (Aiton) Pursh
             Alnus crispa (Aiton) Pursh var. elongata Raup
             Alnus crispa (Aiton) Pursh var. harricanensis Lepage
             Alnus crispa (Aiton) Pursh var. mollis (Fernald) Fernald
             Alnus crispa (Aiton) Pursh var. stragula Fernald
             Alnus mitchelliana M.A.Curtis ex A.Gray
             Alnus mollis Fernald
             Alnus viridis (Vill.) DC. var. crispa (Aiton) House
             Alnus viridis (Vill.) DC. var. fernaldii House
             Alnus X hultenii Murai X
             Betula crispa Aiton
             Duschekia viridis (Chaix) Opiz

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