The features of the Western Sayan specimens of Spiraea L. from the Sayano-Shushenskiy Biosphere Reserve, previously determined as Spiraea media sensulatoare discussed in this article. Taxonomy status of the specimens was examined and the description of a new species Spiraea sozykinii was given.
meadowsweet, Spiraea, Rosaceae, Sayano-Shushenskiy Biosphere reservation, Western Sayan Mountains
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