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The redox potential of flowers of Achillea plants was measured by means of a puncture method. Measurements were performed in 6 taxa (species and hybrids) in the stage of bud formation, full flower and flower shedding in 2000 and 2001. The content of essential oil was estimated in the period of full flower. Differences in the values of redox potential (177–213 mV) and contents of essential oil (1.5–6.1 ml/kg) measured in individual Achillea species and their hybrids were significant. The correlation between the content of essential oil and values of redox potential was closely below 95% of significance.

Possibilities of differentiation of individual Achillea species on the basis of redox potential measurements