Syntaxonomy of the <i>Robinia pseudoacacia</i> communities in the central peri-adriatic sector of the Italian peninsula AllegrezzaMarina MontecchiariSilvia OttavianiCecilia PellicciaVeronica TeseiGiulio 2019 <p>This study presents the results of a floristic vegetational study on <i>Robinia pseudoacacia</i> neoformation forests in the peri-Adriatic sector of central Italy. This has allowed the characterization of these coenoses at the ecological, biogeographic, syntaxonomic and landscape levels. These currently represent the southernmost syntaxa of the <i>Robinietea</i> class described for the Italian peninsula, and the first syntaxonomic contribution of this class in Europe for the Mediterranean biogeographical region. We propose here the new alliance <i>Lauro nobilis–Robinion pseudoacaciae</i> of the order <i>Chelidonio–Robinietalia pseudoacaciae</i> and class <i>Robinietea</i>, with two new associations: <i>Melisso altissimae–Robinietum pseudoacaciae</i> and <i>Rubio peregrinae–Robinietum pseudoacaciae</i>. The new alliance <i>Lauro nobilis–Robinion pseudoacaciae</i> (typus: <i>Melisso altissimae–Robinietum pseudoacaciae</i>) brings together neoformation forests and pre-forest dominated by <i>R. pseudoacacia</i> in those territories with a Mediterranean macroclimate of the peri-Adriatic sector of central Italy. The optimum is found for the alluvial plain and low-slope morphologies, on soils that are moist and rich in organic matter and in areas with anthropic disturbance. On the basis of comparisons with the European context, the alliance <i>Bryonio–Robinion</i> described for the temperate territories of northern Italy is here validated.</p>