The introduction of maple species in the Republic of Komi

The material on the results of introduction of species of maple in the territory of the Republic of Komi is presented. The information about the first planting of maple in Syktyvkar and their species composition and frequency of occurrence in plantations is given. There is noted the extremely low level of use of maples in landscaping. There are just four species in green plantings: Acer negundo, A. tataricum, A. ginnala and A. platanoides. The plants have good condition. They reached high sizes, regularly flower and fruit, are not subject to dis- eases and pests. Data of many-year observations of the progress of growth, development and hardiness of the maples in the collection plantings of the Botanical garden of the Institute of Biology, Komi Science Centre, Ural Branch, RAS, are provided. 14 species including seven new mainly of Far Eastern origin are studied. The maximum age of maple plants of old collection is 50-80 years, which testifies to their durability. Young plants of the new species are 8-13 years. The rhythm of growth of annual shoots in the dynamics of the new types of maple is investigated. Four species with a favourable rhythm of seasonal development and high hardiness are identified: Acer ukurunduense, A. spicatum, A. tegmentosum and A. pseudosieboldianum. They can be recommended for use in landscaping.