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World Checklist of Selected Plant Families (WCSP)

Alnus occidentalis Dippel, Handb. Laubholzk. 2: 158 (1891), non Rérolle (1884), fossil name.

This name is a synonym.

Accepted Name: Alnus incana subsp. tenuifolia (Nutt.) Breitung, Amer. Midl. Naturalist 58: 25 (1957).
Family: Betulaceae
Homotypic Names:

Alnus tenuifolia var. occidentalis Callier in C.K.Schneider, Handb. Laubholzk. 1: 133 (1904).

Alnus incana var. occidentalis (Callier) Hitchc. in C.L.Hitchcock & al., Vasc. Pl. Pacif. N. W. 2: 73 (1964).

Original Compiler: R.Govaerts