Dimensional and genetic characterization of the last oriental plane trees (Platanus orientalis L.) of historical sites in Lazio (central Italy)

•Tools to preserve last veteran oriental plane trees in Lazio.•Use of the COVE protocol to estimate ecosystem services provided by ancient trees.•Taxonomic identification and genetic variability of plane trees in monumental sites.•GIS based approach for the management of ancient plane trees.•Effects of past management practices on the current tree architecture and health status.