An ethnobotanical study was set up to characterize the medicinal florula used in the treatment of symptoms, affecting the populations of the villages of Bana, Banka and Tenchieu. The ethnobotanical surveys were carried out in French or local languages with 30 people for each village, using the survey forms. The study identified 104 species in 90 genera and 45 families. The most representative family was Asteraceae (19.83%). The plant species included twenty-four phytogeographic types, of which the Afro-tropical zone (34.44%) was the most represented. The morphological type that predominated was herbaceous (39.60%), followed by shrubs (34.75%). The dominant type of diaspora was that of the sarcochora (43.56%). The leaves were the most used parts. The oral route was the mode of administration par excellence of the said recipes. The decoction (48.47%) was the most used method of preparation. Factor of citations with values greater than 50% would evaluate the efficacy of certain medicinal plants for the treatment of identical symptoms in a village or other villages. Secondary metabolites were unevenly distributed in plants, with a predominance of alkaloids (36.53%), phenols (23.70%) and coumarins (21.15%). These plants constitute a database for evaluating their biological and chemical potentialities.

Demographic change is responsible for the degradation of wetlands Nyong river. The overall objective of the study has been to analyze socio-economic factors who manage Nyong river, Mbalmayo Distric. Interviews and surveys of the local population have been made. The local population is mainly the men (61%), mainly to 41-60 year hold (60%). They practice mainly agriculture on the banks of Nyong river (43%). The plants are invasive (40%) and block river (40%). Biodiversity is factor mainly impacted (50%). The managing of these area for different actors is doing by all abduction of invasive plants (90%), by extraction (60%). The interviews and surveys have highlighted the complexity of interactions between actors. Respondents are aware: they identify the environmental, social, political and territorial raised by the management of risk areas.