This name is a synonym.
* Betula tortuosa Ledeb., Fl. Ross. 3: 652 (1850).
Betula alba subsp. tortuosa (Ledeb.) Regel, Bull. Soc. Imp. Naturalistes Moscou 38(II): 404 (1865).
Betula pubescens subsp. tortuosa (Ledeb.) Nyman, Consp. Fl. Eur.: 672 (1881).
Betula odorata var. tortuosa (Ledeb.) Rosenv., Meddel. Grřnland 3: 707 (1892).
Betula pubescens var. tortuosa (Ledeb.) Koehne, Deut. Dendrol.: 109 (1893).
* Basionym/Replaced Synonym