Abstract
The reliability of morphological parameters of Alnus fruticosa s. l. on the territory of Asian Russia was studied. It has been revealed that the species has a complex internal structure stipulated by the climatic and forest-growing conditions in different parts of the range. The results of phenotypic variability and sequences of internal transcribed spacer ITS1 of nuclear ribosomal DNA of the taxa of the subgenus Alnobetula indicate the species rank of Alnus viridis and subspecies rank of A. fruticosa, A. sinuata, and A. crispa with the priority species name A. crispa. A. maximowiczii, A. glutipes, A. kamtschatica, and A. mandshurica are the result of intraspecific variability of the polymorphic species A. fruticosa.
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