Abstract
The most important records of vascular plant species made in Luxembourg in 2022 and 2023 are presented. In total, 122 taxa are mentioned. Adiantum aleuticum, Amaranthus blitoides, Bidens radiata, Centranthus calcitrapae, Chiastophyllum oppositifolium, Dipsacus laciniatus, Hibiscus trionum, Lagurus ovatus, Lepidium didymum, Rumex patientia and Sedum hispanicum, as well as the potentially invasive species Erigeron bonariensis, Erigeron karvinskianus, Erigeron sumatrensis and Lysichiton americanus are newly listed species found in Luxembourg. The discoveries of new or confirmed locations for Atriplex nitens, Callitriche obtusangula, Carex brizoides, Dysphania botrys, Filago arvensis, Fumaria parviflora, Hylotelephium telephium subsp. fabaria, Leersia oryzoides, Orchis simia, Panicum barbipulvinatum, Serratula tinctoria and Stachys annua are remarkable. The invasive species Ailanthus altissima, Cochlearia danica, Crassula helmsii, Prunus laurocerasus and Senecio inaequidens are spreading further. The implementation of national action plans for threatened species and habitats, as well as systematic fieldwork carried out over the last years, have resulted in the discoveries of new locations of endangered and/or protected species; other, previously known sites, were confirmed.
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