The objective of this study was to evaluate the potentials of beds vegetated with medicinal species (Brillantaisia bauchiensis and Polygonum salicifolium) in a constructed wetland for domestic wastewater treatment in the Western Highlands of Cameroon. The study was carried out between March and September 2017 on plants collected from a natural wetland in Penka-Michel. The two plants species selected based on their ethnobotanical importance were transplanted and allowed to grow to maturity in a prepared natural wetland at Penka-Michel and a constructed wetland for domestic wastewater treatment on the campus of the University of Dschang. Growth parameters were followed for the two plants species in both wetlands. The physicochemical parameters and faecal bacteria concentrations were measured only for the vegetated and non-vegetated/control beds in the constructed wetland. Overall, the two plants species showed increased growth in height, diameter, leaf number and plants density. The change in diameter and density were very significantly influenced by species type in the constructed wetland than in the natural wetland. Generally, plant growth in height, diameter and density were higher with B. bauchiensis in the constructed wetland than with P. salicifolium in both wetlands. The mean faecal bacteria removal was higher in the vegetated beds for some bacteria than in the non-vegetated/control bed. There was a significant difference in the reduction efficiency of TSS, turbidity, BOD, Faecal streptococci and Total coliforms bacteria between the inflow and the outflow of some treatment beds especially the bed vegetated with Brillan

The revival of the coffee sector has led to a renewed national interest in the development of Canarium schweinfurthii, or "Aiélé", a multipurpose tree that dominates the agrarian landscape of the Western Highlands of Cameroon. This study focuses on the structure and Carbon sequestration potential of Aiélé in coffee agroforestry systems in the Bamboutos Division. The species inventory was done on 45 plots of 2400 m2 each within which all individuals with DBH ≥ 5 cm were measured. The estimate biomass and carbon stocks using the allometric models of Chave (2014). The structure in diameter classes reveals that Aiélé in coffee plantations are dominated by old stems with a near absence of futurs stems. The average biomass obtained was 144.1± 27.76 t/ha for an average carbon stock of 67.7 ± 13.05 tC/ha. This study showed that the structure of Aiélé observed in coffee plantations indicates an ageing of the orchards and an almost total absence of regeneration. For this reason, several constraints to tree planting were noted and highlighted and should be removed by technical assistance to farmers. However, the revival of coffee growing promoted by the Cameroonian government should also constitute an asset for the conservation of the species.

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