New floristic data of vascular plants from central and southern Italy

Based on field, herbarium and bibliographic research, we report distributional data for 21 species and subspecies (11 natives included 1 regional alien and 1 cryptogenic, 10 aliens) whose presence has been ascertained for some administrative regions of central Italy. In particular, 10 taxa are new or confirmed to Abruzzo, 7 to Umbria, 2 to Lazio, and 1 to Marche. Some taxa are particularly interesting from a phytogeographical or conservational point of view. Specifically, Astragalus exscapus and Salix pentandra are very rare in Italy. The new findings of Erythronium dens-canis and Thesium alpinum, in Umbria and Lazio respectively, represent the southernmost limits of their Italian distribution.