TY JOUR TI MODIFICATION VARIABILITY OF ECHIUM VULGARE L. IN ECOTOPES OF THE CENTRAL CAUCASUS KW Echium vulgare L KW morphological varia- bility KW biochemical variability KW alkaloids KW heavy metals JO Bulletin of KSAU AU Tamakhina, A.Y. AU Akhkubekova, A.A. AU Korsunov, A.M. PY 2019 IS PB Krasnoyarsk State Agrarian University