This name is a synonym.
Alnus viridis var. sibirica (Spach) Regel, Bull. Soc. Imp. Naturalistes Moscou 38(II): 422 (1865), nom. illeg.
Alnus sibirica (Spach) Turcz. ex Kom., Trudy Imp. S.-Peterburgsk. Bot. Sada 22: 57 (1903).
Alnus hirsuta var. sibirica (Spach) C.K.Schneid. in C.S.Sargent, Pl. Wilson. 2: 498 (1916).
Alnus hirsuta f. sibirica (Spach) H.Ohba, Fl. Japan 2a: 29 (2006).