[New botanical observations on the rare and interesting plants of the Semois hydrographic basin (for the period 1992-1994) [in Belgium and in France]]
1995
Thoen, D. (Fondation Universitaire Luxembourgeoise, Arlon (Belgium))
Several original floristic data were collected during a prospection of the Semois hydrographic bassin from Arlon (Belgium) to Montherme (France), including islands and dead streams. Alisma lanceolatum, Ambrosia artemisiifolia, Arabis hirsuta, Dipsacus pilosus, Elodea nuttallii, Erysimum cheiranthoides, Hydrocharis morsus-ranae, Impatiens glandulifera, Impatiens parviflora, Lamium maculatum, Lobelia erinus, Mimulus guttatus, Oenanthe fistulosa, Ornithogalum umbellatum subsp. umbellatum, Phalaris canariensis, Plantago arenaria, Sempervivum tectorum, Solanum lycopersicon, Solanum villosum, Solidago canadensis, Spirodella polyrhiza, Vinca major are mentioned for the first (or the second) time in the Semois region. Species believed to be extinct or in drastic regression were observed again: Corrigiola littoralis, Eleocharis acicularis, Leersia oryzoides.
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