Environmental niche models predict the presence of the invasive Argentine ant in northwestern Europe, especially along all the French Atlantic coast. Yet, the species has never been observed North from the 45 th parallel in Europe, suggesting either that current models are wrong or that Argentine ants are already spreading north inconspicuously. Here, we report a three-hectare wide colony of Argentine ants, detected in 2016 in Nantes, France, which is 300 km north of the former northern-most outdoor population of this species in Europe. COI sequencing revealed that the haplotype of this new colony is the same as the one found in the so-called Catalonian supercolony, which is distinct from the haplotype found over most of the species range in Europe. Our discovery confirms models' predictions that Argentine ants can colonize north-western Europe and suggests that they might have already reached several other locations along the French Atlantic coast. Detection surveys should be conducted in order to assess Argentine ants' invasion patterns in Western France, particularly in high introduction risk areas such as major cities and maritime ports.

Vascular plants new or rare for Tunisia occurring on the islands (Galite, Zembra, Kuriat, Monastir, Kerkennah, Kneiss, Djerba).-This study concerns the indigenous vascular plants newly reported for Tunisia and discovered on the islands during some field trips performed since 2014. Five native taxa are new to Tunisia: Bellis perennis, Carthamus creticus, Moraea mediterranea, Asplenium balearicum and Galium minutulum, the latter two also being new to North Africa. Information on 24 rare or poorly known taxa, most often of great biogeographical interest, is given, too. Most of these were discovered on the islands of the eastern coast (Kuriat, Monastir, Kerkennah, Kneiss, Djerba), but also on the northern islands of Zembra and La Galite. The new chorological data underline the first-rate conservation importance of these islands and islets for the preservation of the overall coastal biodiversity of Tunisia.

Recent collections from southern Anti-Atlas and northern oceanic Sahara identified as Ammodaucus leucotrichus Coss. & Durieu and Cuminum maroccanum Davis & Hedge (Apiaceae) led us to present a taxonomic revision of the genus Ammodaucus Coss. & Durieu in northern Africa, which is based on morphological and molecular data. Phylogenetic inferences based on original and previously published ITS ribosomal DNA sequences clearly demonstrated that Cuminum maroccanum is not related to the genus Cuminum L. but instead nested within Ammodaucus, which forms a distinct lineage in the subtribe Daucinae. Two clades within Ammodaucus are recognised. The first one includes the accessions corresponding to Cuminum maroccanum, characterized by having long bracteoles and fusiform mericarps and the second one includes the accessions corresponding to Ammodaucus leucotrichus, which displays short bracteoles and oboval mericarps. On this basis, the species Cuminum maroccanum is transferred to the genus Ammodaucus and the name Ammodaucus leucotrichus subsp. nanocarpus Beltrán-Tej. is included in the synonymy. Résumé

Carex echinodes (Fernald) P.E. Rothr., Reznicek & Hipp, inclus dans la section des Ovales Kunth, est une espèce difficile à distinguer des 2 autres espèces de carex du « complexe du C. tenera ». Il a été élevé au rang d’espèce en 2009 à la suite d’études de son ADN et de son nombre de chromosomes. Passé inaperçu dans la flore québécoise depuis plus de 100 ans, C. echinodes a récemment été localisé au Bois-de-Saraguay sur l’île de Montréal. Une recherche dans plusieurs herbiers révèle aussi que cette espèce a déjà été récoltée sur le territoire québécois sans jamais avoir été identifiée correctement. Pour aider à son identification, nous présentons les caractéristiques morphologiques et les habitats des 3 espèces de carex du « complexe du C. tenera ». Nous ajoutons une description détaillée du C. echinodes et un portrait de sa répartition géographique. Finalement, nous soulignons l’importance de la conservation des forêts urbaines et celle d’accorder dans les meilleurs délais un statut de rareté au C. echinodes

Quelques nouveautés concernant la flore vasculaire du Maroc septentrional : Jbel Tazzeka, Jbel Mezgout, région d’Al Hoceima.