TY JOUR TI Biologically active substances in flowers and leaves of Siberian irises KW Iris sibirica KW varieties KW flower KW leaf KW tannins KW flavonols KW pectins KW protopectins KW catechins KW carotenoids KW forest-steppe zone KW Western Siberia JO Agrarian Bulletin of the AU Sedel'nikova, L.L. PY 2023 IS 23 PB Ural State Agrarian University