IRIS SPECIES OF THE SUBGENUS <i>XIRIDION </i>IN THE WESTERN CAUCASUS
Russian Research Institute of Floriculture and Subtropical Crops pays a lot of attention to the work with the species from natural flora. The paper presents the results of studies with four Iris species of the subgenus Xiridion, including three species of Caucasian flora ( I. notha, I. pseudonotha and I. colchica ) and gives their characteristics; the distribution ranges and the data of phenological observations were specified, morphological features of species were recorded; patterns of influence of climatic conditions in a particular area on the plants growth and development were also identified. Finally, the paper gives brief recommendations on their use.