Centranthus calcitrapae (Caprifoliaceae), espèce adventice nouvelle au Grand-Duché de Luxembourg

Centranthus calcitrapae (L.) Dufr. (Annual Valerian) was discovered in June 2022 in a flowerbed on a parking place in Diekirch, Grand Duchy of Luxembourg. The present paper relates the first discovery of this Mediterranean species in Luxembourg and gives a summary of its occurrence in neighbouring areas. Its extension to the north seems to be supported by climate change.