Based on field, herbarium and bibliographic research, we report distributional data for 21 species subspecies (11 natives included 1 regional alien cryptogenic, 10 aliens) whose presence has been ascertained some administrative regions of central Italy. In particular, taxa are new or confirmed to Abruzzo, 7 Umbria, 2 Lazio, Marche. Some particularly interesting from a phytogeographical conserva...