En Côte d’Ivoire, principalement dans le nord, on observe la présence de plusieurs formations végétales très variées allant des forêts claires et aux différents faciès de savanes. Dans la localité de Ferkessédougou, une étude a été menée dans le but de connaître la flore, la végétation et de l’usage des plantes. Cette étude a permis de recenser 192 espèces de végétales. Elles se répartissent en 148 genres et 64 familles. Parmi ces espèces, certaines ont été identifiées comme alimentaires, médicinales ou à divers autres usages. Aussi, vingt sont considérées comme des espèces ayant un statut particulier et qui nécessite une attention particulière en vue de leur protection ainsi que les habitats où elles se rencontrent. La présence de ces espèces peut constituer des indicateurs clés pour le suivi environnemental de la zone d’étude.Mots clés : Diversité végétale, Services écosystémiques, savane soudanienne, Ferkessédougou, Côte d’Ivoire.   English Title: Plant diversity and plant uses in a Sudanese savannah area: Case of the locality of Ferkessédougou (North, Côte d'Ivoire)In Ivory Coast, mainly in the north, we observe the presence of several very varied plant vegetations anging from open forests to different facies of savannah. In the locality of Ferkessédougou, a study was carried out to learn about the flora, vegetation and the use of plants. This study identified 192 species of plants. They are divided into 148 genera and 64 families. Among these species, some have been identified as food, medicinal or various other uses. Also, twenty are considered to be species with a special status and which requires very special attention for their protection as well as the habitats where they occur. The presence of these species can constitute key indicators for the environmental monitoring of the study area. Keywords: Plant diversity, Ecosystem services, Sudanese savannah, Ferkessédougou, Ivory Coast.

Invasive alien plant species represent a great threat to the integrity of ecosystems. Acquiring information on the dynamics of these species on a cartographic basis constitutes a tool for their sustainable management. Among these species, Lantana camara L., known for its environmental and agronomic impacts, is currently reported in several localities of Côte d'Ivoire. The general objective of this study is to model the ecological niche of this species over the entire country. To do so, 89 points occurrences and 19 current and future bioclimatic variables were collected to model the potential distribution of this species on the basis of the RCP 8.5 scenario as part of the HadGEM2-ES climate model. This is 75% of presence data (67 points) used for model calibration and 25% (22 points) for testing. At the end of the modeling carried out with the MaxEnt software, the areas suitable for the species are characterized by low temperatures and heavy rainfall., under current climatic conditions, approximately 65,782.40 km², or 20% of the national territory, is suitable for the invasion of L. camara. Azagny National Park, Banco National Park, and the Iles Nature Reserve Ehotiles have distributions with high probability of the presence of the species. By 2050, the climate projects high temperatures and low precipitation in the future. The results show that by adapting to this new climatic range, the L. camara proliferation area will increase to 78,036.05 km², or 24% of the national territory. An upward trend, with a rate of change of 18.6, has been observed in the favorable areas of this area. To maintain the normal functioning of ecosystems and the sustainability of ecosystem services, the areas that have been identified as the most vulnerable to the invasion of L. camara must be the subject of control strategies of this species. Keywords: Lantana camara, Species modeling, MaxEnt, Côte d’Ivoire, RCP scenario 8.5.

The ruderal areas are starting points for invasion of natural ecosystems by invasive exotic plant. In this study we have inventoried all the invasive plants present in the PNB, highlighted their spatial distribution and followed their evolution of occupation of the soil. The floristic data were first collected by itinerant inventory in the study area. At the end of this inventory, six zones of strong presence of invasive plants were selected: under of high voltage lines, the roadside, the arboretum, the encampments (destroyed encampment and current encampment), the periphery of the park and the portion of Anguédédou forest attached to park, which represents the not ruderal zone occupied by invasive species. Thereafter that of phytosociological records carried inside 203 permanent plots of 50 m². Inside each plot, all invasive species were inventory, counted, and their area of soil occupation was measured consecutive, from 2016 to 2018. 22 species counted, one of which proven invasive and 21 potentially invasive distributed throughout the park. Chromolaena odorata and Hopea odorara constitute a real threat to this park. The encampments, the periphery of the park are the most invaded places in the park. The spatio-temporal dynamics of the species species occupy 12,01 ha of the ruderal areas of the park and 126,84 ha taking into account the planted area of Hopea odorata is 3,68 % of the total surface of the park. These results will make it possible to anticipate and of coordinate actions in order to avoid the large-scale invasion of the park

Pterocarpus erinaceus (P. erinaceus) est une espèce éminemment utile aux populations. La présente étude visait à contribuer à une meilleure connaissance du bois de vène en Côte d’Ivoire. Pour ce faire, des enquêtes ethnobotaniques ont été conduites auprès des populations de dix localités dans la zone rurale de Béoumi et la périphérie de la réserve de faune et de flore du Haut Bandama. Le profil des enquêtés et les pourcentages de réponses sur P. erinaceus ont été analysés à travers des histogrammes et des indices de diversité. Quatre catégories d’usages ont été relevées, médicinale, artisanale, fourrage et bois d’oeuvre. La connaissance des usages de l’espèce est inégalement répartie entre les populations. Les feuilles, l’écorce et les racines sont les organes les plus utilisés. Les populations locales ont une bonne connaissance des causes de régression des peuplements naturels de P. erinaceus. Selon elles, la pratique du charbon de bois, le défrichement des terres pour l’installation des cultures, l’abattage des arbres par les scieurs, les feux de végétation et le non-respect des mesures gouvernementales, constituent les causes de disparition de l’espèce. A cet effet, il devient urgent de mettre en place une stratégie de gestion durable en intégrant les besoins des populations locales.

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