| | Species and varieties
Alnus cordata (Italian Alder)
Alnus glutinosa (Black Alder)
Alnus incana (White Alder, Gray Alder)
Alnus incana ssp. tenuifolia (Mountain Alder, Thinleaf Alder)
Alnus rhombifolia (White Alder)
Alnus rubra (Red Alder)
Alnus × purpusii synonym of Alnus incana ssp. tenuifolia (Mountain Alder, Thinleaf Alder)
Alnus alnus synonym of Alnus glutinosa (Black Alder)
Alnus incana var. occidentalis synonym of Alnus incana ssp. tenuifolia (Mountain Alder, Thinleaf Alder)
Alnus incana var. virescens synonym of Alnus incana ssp. tenuifolia (Mountain Alder, Thinleaf Alder)
Alnus oregona synonym of Alnus rubra (Red Alder)
Alnus oregona var. pinnatisecta synonym of Alnus rubra (Red Alder)
Alnus tenuifolia synonym of Alnus incana ssp. tenuifolia (Mountain Alder, Thinleaf Alder)
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