Notulae to the Italian alien vascular flora: 12

Abstract

In this contribution, new data concerning the distribution of vascular flora alien to Italy are presented. It includes new records, confirmations, exclusions, and status changes for Italy or for Italian administrative regions. Nomenclatural and distribution updates published elsewhere are provided as Suppl. material 1.

New Alien Plant Taxa for Italy and Europe: An Update

“…A few individuals of U. pumila were found at the bottom of a wall. This species is currently spreading in central Italy, where it is widely naturalized [ 35 , 58 ]. This species is naturalized as well in many regions of northern Italy and in Puglia, while it is considered an invasive alien in Piemonte and Valle d’Aosta [ 43 ] and a casual alien in Calabria [ 7 ].…”

“…The floristic list of the taxa is reported in alphabetical order and follows the updated nomenclature and regional distribution of the checklist of the Italian vascular flora available on the Portal to the Flora of Italy [ 43 ], referable to the checklist of the flora alien to Italy [ 27 ] and subsequent updates [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ].…”

“…Newly introduced alien plants in the Italian and European territories and changes in the invasiveness status of species already present in the territory were considered here, in accordance with Pyšek et al [55]. The specimens collected and examined are deposited in the following public herbaria registered in the Index Herbariorum (according to Thiers [162] The floristic list of the taxa is reported in alphabetical order and follows the updated nomenclature and regional distribution of the checklist of the Italian vascular flora available on the Portal to the Flora of Italy [43], referable to the checklist of the flora alien to Italy [27] and subsequent updates [28][29][30][31][32][33][34][35][36][37][38][39].…”

“…Many checklists have been recently published worldwide, at regional [ 21 ] and national [ 22 ] levels, in order to better highlight the diachronic changes locally occurring. Furthermore, in Italy, the knowledge of alien flora in different regions has significantly increased in the last decade [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], although much attention has been paid to highly prioritized IAS in Italy and other European countries, representing a potential threat to the national flora [ 41 , 42 ].…”

Tree invasions in Italian forests

“…We identified and selected the invasive non-native trees (INNTs) for the 21 administrative Italian regions based on: the checklist of the non-native flora of Italy (Celesti-Grapow et al 2009); its updates (Galasso et al , 2018b(Galasso et al , 2018c(Galasso et al , 2019a(Galasso et al , 2019b(Galasso et al , 2020a(Galasso et al , 2020b(Galasso et al , 2021a(Galasso et al , 2021b, most of which included in the Portale della Flora d'Italia (2021) and Acta Plantarum online sources; and additional non-indexed sources (e.g., Alessandrini et al 2018). We included trees (i.e., scapose phanerophytes), woody plants bearing the resting buds higher than 200 cm from the ground and characterized by a clearly identifiable main stem (Raunkiaer 1934;Ellenberg and Mueller-Dombois 1967), that were neophytes, species introduced after 1492 (Pyšek et al 2004).…”