Cluster analysis, correspondence analysis and the method of ecological profiles were used to determine and characterize ecological species groups in woodlands in South Belgium. Two data sets were used, one composed of 260 relev6s, the other of 130 relev6s with soil analyses (A1). Correspondence analysis points out the most important factors influencing the floristic composition of the stations. Nomenclature: De Langhe J.-E. etal. 1983. Nouvelle Flore de la Belgique, du Grand-Duch6 de Luxembourg, du Nord de la France et des rggions voisines. 3 c ed. Jard. Bot. Belg., Meise.