DOI: 10.7256/2453-8809.2021.4.37329

Abstract: The article presents the analysis of the dynamics of the Hydrangeaceae family collection in the "Fruticetum" exposition. The study was conducted on the basis of introduction cards and introduction journals of the BSI as of 2020. Currently, Hydrangeaceae includes 78 names: 6 Deutzia taxa (8 samples), 24 Hydrangea taxa (30 samples), 48 Philadelphus taxa (56 samples). Among all samples, 72.4% came in the form of seedlings, 22.3% – green cuttings, 5.3% – seeds. The main source of hydrangeas is the Main Botanical Garden of the Russian Academy of Sciences, from where 54% of all samples were obtained. Also, samples were received from other botanical gardens, nurseries and from private individuals. The oldest surviving specimen (Deutzia scabra) was received in 1974. The most intensive replenishment of the collection was observed in 1981–1983, later it slowed down. Since the mid-2000s, the attraction of new species and varieties has accelerated again. Graphs showing the dynamics of the number of taxa and samples of the studied genera are given. In total, 389 plants of the studied family grow in the exposition, of which the largest number are Mock orange. Most taxa are represented by 1 to 13 plant specimens. Further increase in the collection is constrained by the shortage of free territory for planting. This article is of interest to employees of botanical gardens, students of plant-growing directions and amateur gardeners.

DOI: 10.7256/2453-8809.2020.4.34972

Abstract: Deutzia is an ornamental flowering shrub valued for its abundant long-term flowering and the elegance of flowers shape. The research objects are the plants of 3 species and 1 variety of Deutzia in the Botanic Garden-Institute of VSUT (Yoshkar-Ola, Mari El Republic). Plants aged from 38 to 45 years grow in the exhibition “Fruticetum”. The study was conducted in 2015-2019. The height and diameter of plants crowns, their winter hardiness for the period from 1981 to 2019, the morphometric indicators of leaves and inflorescences, the possibility of vegetative propagation by herbaceous cuttings, and the size of annual plants were studied. According to the study results, the most hardy is Deutzia of Amur, which forms the highest shrubs. The long-leaved Deutzia has the longest leaf blades, Deutzia scabra ‘Plena’ has the smallest leaves. The long-leaved Deutzia has the largest inflorescences, Deutzia of Amur and Deutzia scabra ‘Plena’ have the smallest ones. Deutzia magnifica and Deutzia scabra ‘Plena’ have ornamentality advantage over other species due to the double flowers. For the maximum display of ornamental qualities, the plants need a successful overwintering. The greatest ability to reproduce by herbaceous cuttings is noted for Deutzia scabra ‘Plena’. The results of this study are important for the Deutzia application in the garden and park construction. In the landscaping of the republic settlements Deutzia is recommended for the target assortment.