| Summary: | Phytosociological studies on the psammophilous vegetation complex in question were conducted using the Braun-Blanquet method in June 2004 in the south-western part of the sand areas of Mankhan-Elysu located in south-eastern Buryatia (Western Transbaikal, on the border of the Russian Federation and Mongolia). Back then, 43 phytosociological relevés and photographic documentation were made. The preliminary results of the survey (Szczypek et al. 2005) led to identifying three separate phytocoenons of psammosteppes as non-hierarchical communities. A subsequent detailed analysis of the material, supplemented or corrected on the basis of verified herbarium specimens proved that besides the three plant associations already described in literature by other authors: Thesio tuvensis-Festucetum dahuricae Dulepova et Korolyuk 2015, Corispermo macrocarpi-Leymetum crassinervi Dulepova et Korolyuk 2015 (=Leymo crassinervi-Artemisietum ledebourianae Namzalow et al. 2017 nom. inval. p.max.p.) and Corispermo sibirici-Oxytropidetum lanatae Dulepova et Korolyuk 2015 (=Oxytropido lanatae-Agropyretum michnoi Namzalov et al. 2017 nom. inval.), six relevés refer to an entirely separate, new type of sandy swards. The article presents a formal diagnosis of a new plant association Orostachyo spinosae-Koelerietum mongolicae and its brief floristic and habitat characteristics. It is assumed that the association is endemic to Mankhan-Elysu and related to ecotone locations between sparse coniferous Siberian taiga with prevailing pine trees and other large-area communities of psammosteppes of the Brometea korotkyi class. Some issues related to the syntaxonomy of the grasslands have also been discussed. Badania fitosocjologiczne roślinności psammofilnej kompleksu piaszczysk Manchan-Ełysu, położonego w południowo-wschodniej Buriacji (Zachodnie Zabajkale; pogranicze Federacji Rosyjskiej i Mongolii), prowadzone były w czerwcu 2004 roku z zastosowaniem metody Braun-Blanqueta. Wykonano wówczas (S. Wika) 43 zdjęcia fitosocjologiczne oraz ...
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