The article describes syntaxonomy of the class Bidentetea tripartitae Tüxen et al. ex von Rochow 1951 in the valley of the Dnipro River, which includes six associations of one order, Bidentetalia tripartitae Br.-Bl. et R. Tx. ex Klika et Hadač 1944, and two unions, Bidention tripartitae Nordhagen ex Klika et Hadač 1940 and Chenopodion rubri (Tüxen 1960) Hilbig et Jage 1972. The main factors determining their distribution within the valley are differences in relief, soil and hydrological regime. Cenoflora of the class includes 138 species that belong to 105 genera and 43 families. Diagnostic species of the class are: Lythrum salicaria L., Rorippa palustris (L.) Besser, Bidens cernua L., B. frondosa L., B. tripartita L., Polygonum hydropiper L., and P. persicaria L. High constancy is specific to species Bidens frondosa, B. tripartita, and Polygonum hydropiper. Its average level is typical for the species B. cernua, B. connata Muhl. ex Willd. and Juncus bufonius L. Low level is characteristic for Myosoton aquaticum (L.) Moench and diagnostic species of other classes, in particular Potentilla anserina (Plantaginetea majoris), Lycopus europaeus L. (Phragmito-Magno-Saricetea), Agrostis canina L. (Molinio-Arrhenatheretea), Atriplex prostrata DC. (Stellarietea mediae).

Keywords: syntaxonomy, ecological-coenotic characteristic, coastal-aquatic vegetation, valley of the Dnipro River, Bidentetea tripartitae

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