Gray Alder
Alnus incana
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Mountain Alder
Alnus incana ssp. tenuifolia
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White Alder
Alnus rhombifolia
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Red Alder
Alnus rubra
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Green Alder
Alnus viridis
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Siberian Alder
Alnus viridis ssp. fruticosa
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Sitka Alder
Alnus viridis ssp. sinuata