Results of a phytosociological study on the wood on the sandstone bedrock are here presented. The studied area is located in the southern part of Marche Region, Ascoli Piceno Province, under the influence of temperate climate (lower/higher mesotemperate and lower supratemperate bioclimatic belts). The vegetation study has been performed throught 119 phytosociological relevés. All data were submitted to multivariate statistical analysis. The phytosociology analysis has permitted to characterize 6 associations, whereof 2 news: Erico arboreae-Quercetum pubescentis ericetosum arboreae and Hieracio murori-Ostryetum carpinifoliae hieracietosummurori. Chorological and synecological datas were described in the paper, compared to the corresponding associations of the limestones bedrock of the neighbouring area.