About the asymmetry structure of the leaf blade Common plantain Sergey G. Baranov, Igor E. Zykov, Tatyana S. Biryukova, Lubov V. Fedorova and Alla M. Antsyshkina E3S Web Conf., 262 (2021) 04004 Published online: 24 May 2021 DOI: 10.1051/e3sconf/202126204004