Su alcuni aspetti di vegetazione arbustiva mesoigrofila della Sardegna nord-occidentale

The results on the phytosociologic analysis on some shrub caducous meso-higrophylous communities are here presented. The study involves the north-western part of Sardinia (Italy), with major attention to the carbonatic and volcanic sectors of 'Sassarese' and 'Nurra'. The new associationsVinco sardoe-Rubetum ulmifolii,Crataego monaginae-Pyretum amigdaliformisandRhamno alatermi-Spartietum junceiare here described. The first two are included in theRhamno prunateaclass,Pruno-Rubion ulmifoliialliance,the last is refered toQuercea illicilisclass,Pistacio-Rahmnetalia aleterniorder.