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Family: Betulaceae
  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
        mountain alder, speckled alder
    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.
        green alder, mountain alder, Sitka alder
    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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