摘要: The Rosa genus is critical taxon. Because of difficulties in species identification, nobody had dealt with the distribution of this genus. Aim of this research was presenting main traits of distribution of roses of the Moksha river basin using method of grid mapping. Special focus was devoted to three well-recognizable species: Rosa rubiginosa L., R. villosa L., R. glauca POURR. The floristic studies were carried out in the years 2010–2014. As a result, 423 stands of roses were revealed within study area. This is equal to 201 grid cells at grid map of Moksha river basin. Average number of stands per one grid cell is equal 2.1 with variation of this value from 1 to 26. Almost all taxa of genus Rosa are confined to non-woodland localities. Exception is R. cinnamomea L. s. str. which is the almost only species known in forest landscapes within Moksha river basin. Within study area, R. villosa, R. rubiginosa and R. glauca are known from 17, 4 and 1 grid cells, respectively.
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