Objective: In order to contribute to the knowledge of medicinal plants used for diseases treatments and symptoms affecting rural populations of the Sanaga Maritime division, ethnobotanical and ethno pharmacological investigations have been carried. Methodology and results: Only people aged between 29-70 years with a confirmed knowledge of medicinal plants and their usage in curing and willing to take part of the study have been interviewed. The study realized in 94 homes allowed making an inventory of 94 vegetable species belonging to 92 genera and 54 families. The most representative were Fabaceae, Euphorbiaceae and Asteraceae respectively 9 and 6 for the two others. Among those species, 10 genera have been the most representative namely: Aframomum, Alchornea, Allium, Carica, Citrus, Entandrophragma, Ocimum, Solanum, Urera and Vernonia in the following proportions 14% for Allium and Ocimum and 9% for others. Ecological parameters of plants species allowed the identification of 12 types of biotopes with 28.85% species harvested and 21.15% species of primary forests. Sixteen phytogeographical types have been listed to with 24.04% of "pantropicales", 20.19% "Afro tropicales" and 19.23% "guineo congolaises". Exploited species have been in majority herbaceous 37.50%, followed respectively by trees and shrubs with 29.81% and 27.88%. Sarcochores and Slerochores were the high majority of diaspores with the following proportions 43.27% and 13.46%. Decoction and maceration have been the preparation method most used by traditional practitioners with 27.46% and 23.94%. The oral route was the most used for the administration of medicinal plants recipes. 80 recipes have been retained for the treatment of diseases and symptoms affecting people of this division. The consensus factor permitted to confirm that troubles caused by protozoa and mycoses were raging in that division with 0.71 and 0.50 respectively. Have been identified as secondary metabolites: alkaloids, flavonoids, coumarins, phenols, tannins, saponins and terpenoids. Leaves represented the most used part for the preparation of recipes.
Conclusion and applications of results:The usage of medicinal plants by African people and others in the world for the multiple diseases pushed researchers to explore this way to find new molecules.