New additions to the vascular flora of central and southern Italy

New or revised plant records of 27 taxa (species and subspecies) are reported for central and southern Italy, of which 13 are natives and 14 aliens. Two native taxa are new for the Apennines, one is new for central Italy, nine are new or confirmed for Abruzzo and one is new for Marche. We excluded one previously accepted species from Umbria, one from Abruzzo, one from Molise, and one from Campania. Among the aliens, two species are new for Italy, six for Umbria, four for Abruzzo, two (one confirmed) for Lazio and one for Molise. Furthermore, we propose to change alien status from casual to naturalized for three taxa. Some discoveries are very interesting from a phytogeographical and/or conservation point of view. Additionally, several new locations for very rare species are reported.