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Objectif: Contribuer a une meilleure connaissance de la flore de la foret classee de la Besso et de caracteriser les populations infiltrees et les cultures pratiquees dans cette foret classee. Methodologie et resultats: La foret classee de Besso (Cote d’Ivoire) couvre 23 100 ha sur est une foret dense semi-decidue a Celtis spp. et T riplochiton scleroxylon . La creation de clairieres culturales entre 1966 et 2012 malgre le classement de la foret est a l’origine d’une mosaique de vegetations secondaires incluses dans une matrice de foret « primaire » que nous avons plus particulierement etudie. Les releves de surfaces couples aux inventaires itinerants ont permis d’inventorier 474 especes, qui se repartissent en 330 genres et 91 familles. Les familles les plus abondantes sont Fabaceae, les Rubiaceae, les Euphorbiaceae, les Moraceae, les Malvaceae, les Meliaceae, les Moraceae, les Annonaceae, les Sapindaceae et les Poaceae. Parmi ces especes, 79 % sont des phanerophytes et 3 % des hemicryptophytes. Conclusion: Malheureusement, cette foret est en progressive degradation a cause des activites humaines qui menacent la biodiversite vegetale et animale de cette foret. Ainsi, pour reduire le phenomene de degradation des forets en generale, plusieurs actions de gestion durable pourraient etre entreprises par l’Etat, les ONG et la population. Notamment par la creation des zones de conservation de plantes par des mises en defens de jacheres. Mots cles: Biodiversite vegetale, Foret classee de la Besso, Cote d’Ivoire English Abstract English Title: Floristic diversity and human impact on Besso forest in Ivory Coast Objective: To contribute significantly to the knowledge of the flora of Besso forest and to evaluate the human impact. Methodology and results: The Besso forest in Ivory Coast) covers 23 100 ha and determines a potential vegetation corresponding to the Celtis spp.- Triplochiton scleroxylon semi-deciduous tropical forest. Shifting cultivation between 1966 and 2012 has led to a mosaic of secondary plant communities that are included in an old-growth forest matrix. For hundred seventy for (474) species were recorded in this forest during the field investigations, distributed among 330 genera and 91 families. The most common families were Fabaceae, Rubiaceae, Euphorbiaceae, Moraceae, Malvaceae, Meliaceae, Moraceae, Annonaceae, Sapindaceae and Poaceae. Among those species, 79 % and 3 % are phanerophytes and hemicryptophytes, respectively. Conclusion: Unfortunately, this forest is gradual degradation due to uncontrolled human’s activity. Thus, to reduce the degradation phenomenon of the forets in general, several actions of sustainable managements could be undertaken by the state, Non-Governmental Organisation (NGO) and the population. In particular by the creation of preservation zones of plants, the creation of collective gardens of plants. Keywords: Plant biodiversity, Besso forest, Ivory Coast

Diversité floristique et infiltration humaine de la forêt classée de la Besso (Côte d’Ivoire)