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Betula pumila Linnaeus
Betula nana Linnaeus
Corylus cornuta Marshall
Betula glandulosa Michaux var. glandulosa
Alnus viridis subsp. sinuata (Regel) Á. Löve & D. Löve
Betula papyrifera Marshall
Alnus viridis subsp. crispa (Aiton) Turrill
Betula neoalaskana Sargent
Betula papyrifera Marshall
Betula occidentalis Hooker
Alnus incana subsp. tenuifolia (Nuttall) Breitung