Ben-Erik van Wyk (Author) Ben-Erik van Wyk is a plant taxonomist with broad research horizons that include ethnobotany and economic botany. He is a Professor of Botany based at the University of Johannesburg, South Africa. He currently holds a National Research Chair in Indigenous Plant Use. His research interests include plant classification, useful plants, medicinal plants and ethnobotany. He has authored and co-authored more than 390 scientific papers, 23 books, 30 taxonomic revisions, and more than 100 new plant species and other taxa. He is best known for his series of international full-colour reference books on useful plants, including global reviews of Medicinal Plants, Food Plants, Herbs and Spices, Mind-altering and Poisonous Plants, Phytomedicines, Cut Flowers and Garden Succulents.Michael Wink (Author) Michael Wink is Professor of Biology and Director at the Institute of Pharmacy and Molecular Biotechnology of Heidelberg University; Head of Biology Department (1989-2019). Senior professor since 2019. He is an authority on secondary metabolites of plants and their pharmacological effects. Editor of Diversity, Biotechnology Journal and Journal of Ornithology. Member of several editorial boards and scientific societies. Author of over 20 books and over 900 original peer-reviewed publications.