In the second edition of the Red List of the Sara-tov Region Cleistogenes squarrosa appears with the category and status 3 (R) of rare species. The data on the content and structure of communities with participation of Cleistogenes squarrosa which are wide spread on the territory of Saratov Region are missing in the literature. The data on the con-tent and structure of communities with participation of Cleistogenes squarrosa which is wide spread in Saratov Right bank are provided in the study. The communities of three associations were described: the association of Festuca valesiaca, Festuca valesiaca - Artemisia campestris, Festuca valesi-aca + Helichrysum arenarium - Agropyron fragile. In studied communities 59 species of plants were noted. Leading positions were taken by Asteraceae and Poaceae familie representatives. In the com-munities with Cleistogenes squarrosa which is ab-solutely wide spread corn rooted grassy perennials, in the groups of biennials and annual on 8 types prevail (on 13.6 %). Dwart semishrubs are present-ed by only three types (5.1 %). Ecological analysis of studied flora communities showed that in relation to moistening conditions the types were divided into four groups. The group of xerophytic plants (45.8 %), on the second place there were meso-xerophytic (27.1 %) dominates, xero-mezophytic plants were 11-th (18.6 %). In the relation to soil trophy in communities with region Cleistogenes squarrosa which is wide spread in the group of me-zotrophic plants (55.9 %) prevails. One of studied communities is recommended to inclusion into the List of the phytocenosis needing protection on the territory of the area. The danger of its disappear-ance is estimated at 2 points vulnerable community. Recommended categories of protection-preservation in the status of nature sanctuaries of various rank, control of the condition of communities, the ban of separate types of economic activity.
grass spreader (Cleistogenes squarrosa), plant communities, the Red List, Sara-tov
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