List of plants of the genus Sorbus L., introduced in the Polar-Alpine botanical garden-institute

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.