Statistical analysis
The obtained data were processed by the methods of statistic variation (Sokal and Rohlf 2012). An analysis of the variability of morphological parameters was performed using descriptive statistics (minimum and maximum of the indicator), and range diagrams (mean value ± error of the mean and standard deviation). A comparison of arithmetic means was carried out using Student’s t-test.
The ordination of perfect and pistillate flowers according to the studied parameters was carried out using the principal component method by the Statistica 10.0 software package. Before determining the main components, the morphological features were normalized by adjusting their values to the arithmetic mean.