1. Institute of Agricultural Research for the Development (IRAD), Bertoua, Cameroon
2. African Nature and Conservation (ANC), Yaoundé, Cameroon
3. Department of Plant Biology, Laboratory of Systematics and Ecology, University of Yaoundé I, Yaoundé, Cameroon
4. Department of Forestry, Faculty of Agronomy and Agricultural Sciences, Laboratory of Environmental Geomatics, University of Dschang, Dschang, Cameroon
5. Organisation Pour La Conservation Et Le Développement (OCD), Yaoundé, Cameroun