The article provides a list of the coenoflora species of poplar relict woodlands of the Syrdarya River valley within the Kyzylorda region. The list is compiled on the basis of data obtained as a result of the implementation of grant and contract projects related to the study of flora and vegetation of the middle course of the Syrdarya river. A map of the description points is provided. The taxonomic composition is revealed and a comparative analysis of the spectrum of the leading families with the data of floristic and geobotanical studies of other authors conducted in this region is carried out. In particular, 103 species from 31 families were identified in the cenoflora, with the 5 largest families accounting for 61.2 % of the total number of species. The hierarchical order of addition is as follows: Chenopodiaceae, Asteraceae, Brassicaceae, Poaceae, Fabaceae. Comparative analysis shows that the set of leading families in the compared lists is the same. However, the sequence of the three families changes somewhat: Brassicaceae, Fabaceae, and Poaceae. If the floristic composition of the floodplain of the valley of the Syrdarya river Poaceae takes 3 spot, followed by Fabaceae and Brassicaceae, to sanoflore woodland, the sequence is as follows: Brassicaceae is in third place, followed by. Poaceae and Fabaceae, respectively. The significant role of representatives of Poaceae in the floodplain flora is quite natural, given the significant participation in the composition of vegetation of meadow communities. And the high position of Brassicaceae in the cenoflora, as a rule, of antrogogenously disturbed woodlands, is formed due to the annual anthropophilic species of this family.