Article

A thorough knowledge of the alien flora is an important basis for science and management. In Algeria, a first checklist of the alien flora was published in 2020. Since then, several new taxa have been observed for the first time in this country. This study therefore presents additions to the alien flora of Algeria, based on bibliographic and field research carried out since 2021. For each taxon recorded, the botanical family, life form, geographical origin, invasion status, distribution in Algeria, type of colonized habitat and introduction pathways were indicated. In total, 74 additional alien vascular plant taxa, belonging to 30 families and 53 genera were recorded. Data on the occurrence of seven alien species are reported here for the first time from Algeria: Chlorophytum comosum, Helianthus annuus, Salvia hispanica, Sapindus mukorossi, Tradescantia pallida, Triadica sebifera, and Zinnia elegans, four of these species are also new to North Africa. Most of the newly recorded taxa originate from America (55.4%), Africa (14.8%) and Asia (9.4%). The most represented life forms, are phanerophytes (31 taxa), followed by therophytes (18 taxa) and geophytes (12 taxa). In terms of habitats, 43.2% of the taxa were found in humanmade habitats, 12.1% in semi-natural habitats and the same percentage in natural habitats. Most of the taxa were introduced for ornamental purposes (71.6%). More than half (55.4%) of the taxa are naturalized, 14.8% are in the process of naturalization, and 33.7% are considered potentially invasive in Algeria. As a result of our study, the alien flora of Algeria increases from 211 to 285 taxa, the naturalized flora from 108 to 156 taxa, and the potentially invasive flora from 15 to 40 taxa