Features of the structure of the vegetative organs of an ornamental plant Penstemon digitalis Nutt. ex Sims (Plantaginaceae Juss.)
UDC 581.8
Abstract
The features of the morphological and anatomical structure of the vegetative organs of the ornamental perennial Penstemon digitalis Nutt. ex Sims have been studied as well as the peculiarities of its propagation by self-sowing in the conditions of the central Black Earth Region. The study of anatomical structures was carried out on fixed material using standard botanical methods. The drawings are based on microphotographs obtained using an ocular video camera. The structure of the stem and leaf demonstrates the xeromorphic structure of these organs. The leaves are dorsoventral, hypostomatic, the type of stomatal apparatus is anomocytic. The rosette leaves are narrowed into a winged petiole with one central vascular bundle. The stem has a rounded outline in cross section with two pronounced ribs. Collenchyma and sclerenchyma are well developed in the stem in the form of bast fibers. The type of arrangement of conductive tissues is beamless. The species shows itself to be unpretentious and resistant in cultivation, capable of seed propagation; it can be grown without seedlings, by directly sowing seeds in the ground at the end of autumn, as evidenced by a large number of self-seeding. To preserve the seedlings, they must be grown separately, since they need abundant watering. It is possible to cultivate the plant not only as an ornamental plant, but also as a promising plant for the production of iridoids that have a number of biological activities.
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