Objective : The purpose of the study was to characterize the distribution of weed species in palm oïl following relevant agro-ecological factors. Methods and results : A floristic survey of weeds was carried out on four oïl palm agro-ecosystems of La Mé and Dabou, in southern Ivory Coast. The sampling procedure used involved 4 ecological factors split into as much as 17 sub-factors. The global analysis of ecological profiles showed that the weed population surveyed was composed of 3 groupings

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... om which two were site-specific species. The agro-ecosystem as well as the preceding crop appeared as main effective ecological factors which could explain weed distribution. Furthermore, the analysis of corrected frequency profiles shows 3 ecological groupings regarding the agroecosystem factor and 4 others with respect to the preceeding crop factor. Conclusion and recommendation: Three groupings of weed species were determined from which two were site specific of both locations investigated. The first one was composed of two species, namely Lantana camara and Thaumatoccocus daniellii, as indicators of La Mé agro-ecosystems in the forest zone. The second one was composed of 6 species, i.e. Megastachya mucronata, Polygala multiflora, Anthocleista djalonensis, Asystasia gangetica, Borreria latifolia et Clerodendrum splendens, as indicators of Dabou agro-ecosystems in the savannah zone. The third group involved rather ubiquity-oriented species. The location and the preceding crop stood as main effective ecological descriptors which could explain the distribution of weed species.