Anatomical structure of stem and leave of the species of genus Spiraea L. (Rosaceae)

Abstract

The comparative anatomical structure of stem and leaf of 4 species of genus Spiraea L. from the sections Chamaedryon Ser. and Spiraria Ser. have been studied by light microscopy. At the intersectional level, species differ in the structure of the periderm, form and shapes of epidermal cells. We have not revealed taxonomically significant features in closely related species S. media Schmidt и S. sericea Turcz. We agree to the opinion of those taxonomists who consider S. sericea as a synonym for S. media. In our opinion, it is advisable to regard S. humilis Pojark. as a subspecies of S. salicifolia L. Conditional informative signs of S. humilis are a three-four-layer collenchyma under the adaxial and abaxial leaf epidermis, and also the absence of trichomes on the leaves, and papillary outgrowths on the abaxial epidermis of the leaf.