Studio fitosociologico delle praterie della Valle dell’Ambro (Parco Nazionale dei Monti Sibillini, Italia centrale)

This study regards the phytosociological investigation of grassland ecosystems in the Ambro Valley (Sibillini Mountains National Park, Marches, central Italy). In the valley limestones and marly-calcareous substratum there are (Umbro-Marchean Stratigraphic Series). In this area (650-2332 m a.l.s.) are present the following bioclimatic belts: upper mesotemperate, lower and upper supratemperate, orotemperate. The phytosociological typologies founded belong to 8 vegetation classes. Two new associations (Festuco italicae-Plantaginetum atratae festucetosum italicae and Pulsatillo millefoliatae-Saxifragetum ampullaceae pulsatilletosum millefoliatae) and 4 new subassociations (Stachydo divulsae-Brachypodietum genuensis trifolietosum alpestris, Ranunculo pollinensis-Plantaginetum atratae alchemilletosum nitidae, Carici kitaibelianae-Salicetum retusae plantaginetosum atratae e seslerietosum juncifoliae) have been described