Abstract. Delforge, P.- Diverse reflections on some Orchids of Wallonia [Natural. belges 79 (Orchid. 11) (1998): 201-218]. Research in Wallonie (southern Belgium) and numerous observations during nearly 20 years by various authors and members on the ÇSection OrchidŽes d'Europe des Naturalistes belgesČ have led to a reappraisal of the occurrence, the systematics and the nomenclature of Walloon orchid species. The present paper describes succinctly the present situation and dynamics in Wallonie and adjacent regions of Epipactis palustris, Listera ovata, Goodyera repens, Platanthera bifolia, P. chlorantha, Gymnadenia conopsea, Dactylorhiza majalis, D. praetermissa, D. fuchsii, D. maculata, D. ericetorum, and Orchis morio and evokes some systematic and nomenclatural uncertainties for Platanthera bifolia, Gymnadenia conopsea, Dactylorhiza praetermissa, D. maculata s.l., and D. ericetorum.

Key-Words: Flora of Wallonia, Belgium, The Netherlands, western Germany, northern France, Luxembourg; Nature protection; Orchidaceae, Epipactis palustris, Listera ovata, Goodyera repens, Platanthera bifolia, Platanthera chlorantha, Gymnadenia conopsea, Dactylorhiza majalis, Dactylorhiza praetermissa, Dactylorhiza fuchsii, Dactylorhiza maculata, Dactylorhiza ericetorum, Orchis morio.