The paper deals with the morphological characteristics of some species of the genus Rebutia K. Schum. under the protected ground of Donetsk and the Nikita botanical gardens. The main methods of research are: morphological (descriptive) statistics. As a result of the morphological analysis of the genus Rebutia (R. arenaceae, R. flavistyla, R. fiebrigii, R. krainziana, R. neocumingii, R. senilis) revealed distinct qualitative and quantitative parameters of their vegetative and generative organs. Among these parameters are: the color of the epidermis; the color of the spines; areola color; the color of the flower tube; color of outer petals; Interior color of petals; Color column and stigma; the color of the filaments; diameter escape; number of thorns; length of spines, which may be used as diagnostic (identification) for identifying promising assortment of cacti for implementation in micro–landscape phyto–design. It is confirmed that the distinctive morphological parameters investigated representatives of the genus R. arenaceae, R. flavistyla, R. fiebrigii, R. krainziana, R. neocumingii, R. senilis from different sources of introduction (Donetsk and Nikita botanical gardens) due to their ecological and geographical confinement. Cacti grow in the Brazilian region, Central Brazilian Province (in the area of Cochabamba), where the temperature ranges from 0.6 to 45.0° C. Under the conditions of the protected ground Nikita botanical garden cacti growing season takes place at a temperature ranging from 8.0 to 45.0 °C; underground Donetsk botanical garden protected from 6.0 to 40.0 °C. Thus, the temperature ranges are protected soil conditions Donetsk and Nikita botanical gardens fit into the possible temperature range is a natural space of cacti growing in which the representatives of the genus Rebutia can successfully undergo seasonal and ontogenetic development.