Features of the generative period of species Sorbus L. development, introduced in the North (Komi Republiс)

In paper the results of researches the features of generative period of development of species genus Sorbus L. ( S americana, S. sibirica, S. sambucifolia, S. mougeottii, S. x hydrida, S. austriaca, S. aucuparia ) at introduction in the middle taiga subzone of Komi Republic are given. The analysis of phenological development of the introduced plants is carried out. It is established that the seasonal rhythm of development of species genus Sorbus corresponds to climatic conditions of the region of introduction. Some features of development of the plants generative sphere are revealed.