Variability of morphological traits of the Spiraria (Spiraea, Rosaceae)

Abstract

Abstract There is no consensus on the system of the genus spiraea, research is being conducted in the direction of studying morphology, biochemistry, and molecular genetics. The aim of this study is a comparative analysis of the variability of spirea species by a complex of morphological traits. 6 taxa of spirea belonging to the Spiraria section of 21 categorical traits and 5 numerical traits are described. Statistical parameters of variation, Spearman rank correlation, one-way ANOVA, clustering analysis Ward’s method were used for data analysis. Numerical traits of panicles are characterized by medium and high variability (variation from 16 to 39.7%). According to the length of the panicles, S.salicifolia (14.7 cm) and S.x billardii (10.9 cm) are distinguished, according to the number of flowers in the panicles, S.alba (194 pcs.) and S.salicifolia (1298 pcs.). A functional relationship was revealed between the signs of pubescence of the panicles and pedicel with the shape of the end of the leaf blade. According to the complex of morphological traits, objects are grouped into three clusters. The selection of a complex of morphological identification traits makes it possible to determine plants. Information about the relationship of traits has practical application in breeding work.