Notes floristiques. Observations faites au Luxembourg (2024-2025)

The most important records of vascular plant species made in Luxembourg in 2024 and 2025 are presented. In total, 137 taxa are mentioned. Amaranthus viridis, Chenopodium ×reynieri, Coronilla scorpioides, Cotoneaster rehderi, Crassula tillaea, Cuscuta campestris, Echium plantagineum, Fumaria muralis subsp. boraei, Lobelia erinus, Lolium ×boucheanum, Melampodium montanum, Nassella tenuissima, Phedimus ellacombeanus, Physalis peruviana, Salvia hispanica, Stellaria pallida, Tellima grandiflora, Tribulus terrestris, Verbascum chaixii, Verbascum ×intermedium, Verbascum ×incanum, as well as the potentially invasive species Cyperus esculentus, Lagarosiphon major, Ludwigia grandiflora subsp. hexapetala, Myriophyllum rubricaule and Pontederia cordata are newly listed species found in Luxembourg. The discoveries of new or confirmed locations for Anacamptis morio, Anthoxanthum aristatum*, Chenopodiastrum murale*, Conringia orientalis*, Dichoropetalum carvifolia, Eleocharis ovata*, Filago germanica*, Filipendula vulgaris, Heliotropium europaeum, Myriophyllum alternifolium, Najas major, Parietaria officinalis, Poa bulbosa var. vivipara, Potentilla supina, Scandix pecten-veneris*, Silene noctiflora, Stachys annua and Thelypteris palustris are remarkable (* red listed as regionally extinct). The invasive species Ailanthus altissima, Buddleja davidii, Crassula helmsii, Erigeron annuus, Lysichiton americanus, Paulownia tomentosa and Senecio inaequidens are spreading further. The implementation of national action plans for threatened species and habitats, systematic fieldwork carried out over the last years, as well as numerous citizen science contributions have resulted in the discoveries of new locations of endangered and/or protected species; other, previously known sites, were confirmed.