Contribution to the floristic knowledge of Sillaro, Santerno, and Senio high valleys (Toscana, Italy)

The inventory of the taxa collected during the annual field trip of the working group for Floristics, Systematics and Evolution of the Italian Botanical Society is reported. The field trip was held in 2019 along the Sillaro, Santerno, and Senio high valleys located in Toscana (central Italy). The flora documented for the studied area amounts to 492 specific and subspecific taxa (including five hybrids), belonging to 254 genera and 77 families. Bromopsis caprina, Ophrys appennina, O. classica, Polygala flavescens subsp. flavescens, and Pulmonaria vallarsae subsp. apennina were the only five Italian endemics found in the study area, whereas 28 alien taxa were detected. Finally, nine taxa (seven native and two alien) have to be considered as new records for the regional flora of Toscana.