History and Evolution of Flower-Based Medicines

Plants have been an important part of human civilization for millennia, serving as a major source of substance, fuel, and pharmacological subsistence. The evolution dates back to 470 million years ago during the Ordovician period, when aquatic algae developed as land plants for the first time. Over time, these evolved into water-loving bryophytes such as mosses, which could survive on land for longer durations, and then into gymnosperms and eventually into flowering plants – angiosperms – about 140 million years ago. This chapter explores the development and evolution of flower-based medicine, examining the role of flowers and their secondary metabolites in traditional and modern pharmacological practices. Additionally, the chapter addresses the key challenges of conserving flowering plant biodiversity in the context of climate change, anthropogenic pressure, and environmental degradation while emphasizing building a strategy for sustainable use and preservation of flower-based medicinal plants to ensure the continuous use of this precious bioresource.