TrnL-trnfF cpDNA polymorphism in some representatives of the genus Betula Svetlana Medvedeva, Olga Cherepanova, Olga Tolkach, Vasiliy Ponomarev and Galina Malosieva BIO Web Conf., 35 (2021) 00017 Published online: 17 September 2021 DOI: 10.1051/bioconf/20213500017