Introduction Communities Agropyro pectinati–Stipa capillatae from the semidesert steppes is located the southern Moldova, in the territory of two districts: Vulcănești and Cahul. Steppe species were the most stable and important component of the fl ora of the slopes (15-37% of the species represented the class Festuco-Brometea). Material and methods Phytocoenoses of Agropyro pectinati–Stipa capillatae were investigated in the southern Moldova, during our recent fi eld works on years 2007-2012. The present study is based on 15 vegetation relevés. Phytosociological surveys were conducted according to the classical methodology of the Zürich-Montpellier school (Braun-Blanquet, 1964). Results and discussions The ecology and phytocoenological characterisation. Phytocoenoses of Agropyro pectinati–Stipa capillatae consisting of Agropyron pectinatum and Stipa capilata, are spread any pastures in the investigated area, creating compact island of various sizes. Also, due intensive depasturage, a secondary association was installed Festuca valesiaca. Relevant survey were found around localities: Giurgiuleşti, Câşliţa Prut, Văleni, Slobozia Mare (Cahul), Etulia (Vulcănești), Ciumai (Taraclia). Agropyron pectinatum and Stipa capilata grows on arid lands and moderate inclination hills. Since stationary conditions in the investigated area not so varied, a poor fl oristic composition was observed 43 species. The spectrum of the bioformes - the hemicryptophytes are clearly dominant 53,48%, followed by the therophytes with 25,58%, terophytes biennial 11,62%, geophytes and chamaephytes 4,65% each. The analysis of the phytogeographic elements euriasiatic element 46,51% and pontic species 25,58%, followed by the european and central-european 9,30%, mediterranean and cosmopolite with 4,65% each. The analysis of the ecologic spectra xeromesophytes species 63%, the xerophytes 34,8%. The thermic factor is predominated temperate-thermophile and microtherm 41,86% each, thermophile 11,62% and 4,65% represented microterms species. According soil reaction the most of species are slightly acid-neutrophilious 62,8%, acid-neutrophilious 21%, amphytolerant 9,30%, neutrobasiphile 4,65% and acidophile is represented by one species. Conclusions The fl oristic composition of the communities Agropyro pectinati–Stipa capillatae is represented vegetal communities of semidesert steppes, fact that confi rms species dominant Agropyron pectinatum and Stipa capilata, class Festuco- Brometea. The base for pasture in the investigated area useful depasturage. Due the intensive deapasturage, the association has a low forage value, mostly degraded and replaced with the phytocoenosis from the association Taraxaco serotinae – Botriochloa ischaemum, also having forage value. The association Agropyro pectinati–Stipa capillatae gives 35% of coverage and this factor is infl uenced by the natural station conditions, altitude, humidity of soil. The analysis of presence of communities Agropyro pectinati–Stipa capillatae conducted by the researchers allowed them to identify the most valuable objects which should be subject to protection.