Validization of names and brief characteristics of several syntaxa of the Lower Don valley

Four syntaxa are validated with the previous names regarded as invalidly according with the fourth edition of the International Code of Phytosociological Nomenclature . Brief characteristics of the syntaxa are given and diagnostic species are indicated. The alliance Eryngion plani Golub et Saveleva in Golub, Chuvashov, Nikolaychuk all. nov. hoc loco. The nomenclature type of the alliance (holotypus) is association Senecioni-Plantaginetum lanceolatae Golub et Saveleva in Golub, Chuvashov, Nikolaychuk ass. nova hoc loco. The association Senecioni-Plantaginetum lanceolatae Golub et Saveleva in Golub, Chuvashov, Nikolaychuk ass. nov. hoc loco. The nomenclature type of association (holotypus) is relevé no. 326 in tab. 44, p. 271 in the book Krasheninnikov et al. (1928). The association Carici praecocis-Lythretum virgati Golub et Saveleva in Golub, Chuvashov, Nikolaychuk ass. nova hoc loco. Nomenclature type of association (holotypus) is relevé no. 323 in tab. 42, p. 267 in the book Krasheninnikov et al. (1928). The association Stipo lessingianae-Festucetum pseudovinae Golub et Saveleva in Golub, Chuvashov, Nikolaychuk ass. nova hoc loco. The nomenclature type of association (holotypus) is relevé no. 10 in tab. 48, p. 283 in the book Krasheninnikov et al. (1928).