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Plant communities dominated by  Petrosedum  ser.  Rupestria  in Italy have always been referred to the  Sedo albi-Scleranthetea biennis  Br.-Bl. 1955 class. This group of species was also often found more or less abundant in the garrigue and pasture vegetation. Some unusual plant communities dominated by  Petrosedum rupestre  (L.) P.V.Heath with a conspicuous presence of typical species of scree vegetation were found and sampled in the Abruzzo region, on more or less mobile debris. In order to classify such communities, syntaxonomic, structural, chorological and ecological analyses have been performed. All the  Petrosedum  ser.  Rupestria  dominated communities reported in Italy have been compared with the sampled vegetation. A new perennial pioneer association, linked to more or less mobile detrital substrata of the hilly and lower-mountane belts of the calcareous Central Apennines has been here described with the name  Linario purpureae-Petrosedetum rupestris . Based on the syntaxonomic analysis, this association has been included in the  Linarion purpureae  alliance ( Scrophulario bicoloris-Helichrysetalia italici  order). The  Linario-Petrosedetum  has been divided into two subassociations: a typical one named  petrosedetosum rupestris  and a thermophilous one of the lower altitudes named  teucrietosum flavi . The study revealed the originality of such communities and their appropriate classification in the  Thlaspietea rotundifolii  class. This is the first record in Italy of a  Petrosedum  ser.  Rupestria -rich community framed in the scree vegetation class.

A new pioneer association of detrital substrata of the hilly and low-mountain belts in Central Apennines (Italy)