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The article contains a list of introduced specimens of the genus Lonicera L. in the collection fund of the Polar-Alpine Botanical Garden-Institute. The PABSI collection includes 50 specimens of introduced plants of the genus Lonicera, belonging to 16 species, 8 intraspecific taxa and 2 hybrids. The age of collection honeysuckles is from 8 to 82 years. Most of the samples of honeysuckle surveyed are viable and are distinguished by high decorative qualities, winter-hardy and retain their vital form. The most viable, promising for introduction and have high decorative qualities are L. involucratа and L. caerulea. The study is one of the stages of a comprehensive description of plants states when introduced into the conditions of the Far North.

The article contains a list of introduced specimens of the genus Sorbus L. - mountain ash in the Polar-Alpine Botanical Garden-Institute located above the Arctic Circle. The collection fund contains 56 samples of introduced plants of the genus Sorbus, belonging to 22 species and 1 subspecies. The article gives a comprehensive assessment of the viability and decorativeness of introduced plants of the genus Sorbus in the conditions of the Kola Subarctic. 75 % of the studied samples retain and are able to restore the growth shape. In half of the samples, the seeds ripen not annually, for reproduction in the culture it is necessary to attract seeds from other regions. Rowans with the highest vitality scores also have higher ornamental qualities. Evaluation of the viability and decorativeness of introduced plants of the genus Sorbus made it possible to divide the studied samples into groups: quite promising highly decorative, viable high and medium decorative, less and unpromising low and medium decorative, unviable medium and low decorative. In the conditions of the Kola Peninsula, the most viable and decorative S. aucuparia, S. aucuparia subsp. sibirica, S. sambucifolia, S. hybrida, S. commixta, S. tianschanica. The introduction of the species S. albovii, S. buschiana, S. fedorovii, S. subfusca, S. turkestanica is not promising, the plants are of interest for scientific collections.

The collection fund of the Polar-Alpine Botanical Garden-Institute contains 56 samples of introduced plants of the genus Sorbus L., belonging to 22 species and 1 subspecies. Sorbus americana, S. aucuparia, S. aucuparia ssp. sibirica, S. commixta, S. gorodkovii, S. sambucifolia bloom and bear fruit every year. S. albovii, S. buschiana, S. fedorovii, S. hybrida, S. koehneana, S. margittaiana, S. matsumurana, S. mougeotii, S. refflexipetala, S. scopulina, S. sitchensis, S. subfusca and S. tianschanica bloom and bear fruit irregularly. S. aria flowers in isolated years, the fruits do not ripen. S. turkestanica does not bloom. S.esserteauiana and S.vilmorinii did not reach generative age. The score of winter hardiness of investigated mountain ashes is 1-3, with the exception of S. albovii, S. buschiana, S. fedorovii, S. subfusca and S. turkestanica, characterized by winter hardiness scores 3-5.

The collections of open and closed ground of the northernmost Russian Polar-Alpine Botanical Garden-Institute named after N. A. Aurorin, located 120 km north of the Arctic Circle near the cities of Apatity and Kirovsk (Murmansk region), contain a unique gene pool of introduced and local plants. The collection fund of open ground plants currently includes 1864 species, subspecies, varieties, forms, varieties and plants of hybrid origin from 407 genera of 94 families. An analysis of the existing species diversity of the group of rare and endangered plants in the open ground collections of the Polar-Alpine Botanical Garden was made. The assessment of the risk of extinction of plant species was carried out using the criteria of the International Union for Conservation of Nature. The article contains a list of rare and endangered plants grown in the collection nurseries of the garden. The list of rare endangered plants in the collection fund of the Polar Alpine Botanical Garden did not include inadequately studied taxa with the conservation status DD. The Red List of Threatened Species of the International Union for Conservation of Nature includes 212 plants of the open ground collection of the Polar-Alpine Botanical Gardens Institute in need of protection, belonging to 102 genera of 46 families. 2 species have CR status - species that are on the verge of extinction. 5 species of herbaceous and 6 species of wood introducers have the EN conservation status (endangered species) , 2 species of grassy and 1 species of wood introducers are in a vulnerable position (conservation status VU). There are 6 species of grassy and 2 species of wood introducers in a state close to threatened (environmental status NT). 96 species of herbaceous plants, 2 shrubberys and 90 species and subspecies trees and shrubs have LC conservation status.

A list of seeds of cultivated plants collected in 2017-2018 at the Polar-Alpine Botanical Garden-Institute, offered for exchange with other botanical gardens and institutions.

The work is devoted to the study of lateral shoots' seasonal growth of introduced species of Crataegus L. in the Kola Peninsula conditions (as exemplified by the city of Apatity). The alternation of the periods of intensive and weakened growth caused by weather conditions is typical for seasonal dynamics of growth of lateral shoots of the samples Crataegus L. introduced in the central part of the Kola Peninsula. The culmination of the linear growth of shoots occurs with an increase in average daily values of temperature and relative humidity of air. Species affiliation affects the duration of linear growth of lateral shoots of introduced Crataegus species.

There are representatives of 27 families, 60 genera, 306 species and 44 intraspecific taxons (3 varians, 17 forms and 24 classes), 22 hybrids, 372 taxon in total, 792 samples in the collections of woody introducents. The collection is dominated by plants of cultural origin, grown from seeds. 88 percents of plants are characterised by score of winter hardiness from 1 to 3. More than a third of the plants have been in testing for 31-40 years. Generative development is typical for most plants.

In the article results of long-term phenologucal observations of introduced species of Picea A. Dietr. on the Kola Peninsula. The cycle of vegetative development of types of Picea corresponds to the vegetative period of a place of an introduction.

The article contains information about a collection of plants Pinaceae Lindl. in Polar-Alpine Botanical Garden-Institute. The analysis of structure of the introduced plants of Pinaceae family in vital forms, an origin of initial material, features of wintering and reproductive development is carried out.