New Alien Plant Taxa for Italy and Europe: An Update

Area of Science:

• Ecology
• Botany
• Environmental Science

Background:

• Alien plant species pose a significant threat to native biodiversity and habitats.
• Recent years have seen a sharp increase in new alien plant taxa introductions in Italy and Europe.
• Slowing the spread and mitigating the negative impacts of alien flora remains a challenge.

Purpose of the Study:

• To investigate the current status of alien plant species across much of the Italian territory.
• To determine if the alarming trend of new alien plant introductions is still ongoing.
• To update knowledge on alien taxa and their dynamics in Italy.

Main Methods:

• Field surveys and specimen collections were conducted across 12 Italian regions.
• Alien plant taxa were identified using country-of-origin literature and current international nomenclature.
• Collected specimens were documented in public or private herbaria.

Main Results:

• Updates on 106 taxa were reported, including 117 new records (89 first records, 27 status changes, 1 extinction).
• Seven new taxa for Italian alien flora were identified, with two being new to Europe.
• Calabria, Sardegna, and Sicilia showed the highest number of records; five taxa were newly classified as invasive aliens.

Conclusions:

• Floristic investigations are crucial for understanding alien taxa dynamics and expanding current knowledge.
• The study confirms the continued spread of alien plants in Italy, underscoring the need for ongoing monitoring.
• New records and newly identified invasive species highlight the dynamic nature of alien flora in Italy.