Phytosociological and numerical analyses of grasslands dominated by Sesleria juncifolia s.l. in Serbia were performed in order to resolve their syntaxonomy and nomenclature. Twelve releves were sampled on Mt. Mučanj (western Serbia), which were then compared with similar releves from other parts of the Balkan Peninsula by means of numerical analyses. The releves were classified using cluster analysis, while the ordination was conducted using Detrended Correspondence Analysis (DCA). The results suggest the occurrence of two floristically well defined Dinaric associations in Serbia: Seslerio juncifoliae-Edraianthetum graminifolii ass. nova from Mt. Mokra Gora (Oxytropidion urumovii, Elyno-Seslerietea) and Diantho petraeae-Seslerietum juncifoliae ass. nova (Chrysopogono-Saturejion, Festuco-Brometea) from Mt. Mučanj. Naredili smo fitocenološko in numerično analizo travišč v katerih prevladuje vrsta Sesleria juncifolia s.l. in predstavili sintaksonomske in nomenklaturne rešitve. Dvanajst vegetacijskih popisov smo naredili na gori Mučanj (zahodna Srbija) in jih z numeričnimi metodami primerjali s podobnimi popisi z drugih delov Balkanskega polotoka. Popise smo klasificirali s klastrsko metodo, za ordinacijo smo uporabili korespondenčno analizo z odstranjenim trendom (DCA). Rezultati kažejo na obstoj dveh floristično dobro utemeljenih dinarskih endemičnih asociacij v Srbiji: Seslerio juncifoliae-Edraianthetum graminifolii ass. nova z Mokre Gore (Oxytropidion urumovii, Elyno-Seslerietea) in Diantho petraeae-Seslerietum juncifoliae ass. nova (Chrysopogono-Saturejion, Festuco- -Brometea) z gore Mučanj.