Teucrium  species are an intersting object of research in the various aspects of science with multiple applications. With more than 300 species,  Teucrium  is one of the largest and well distributed genera of the Lamiaceae family. Known medicinal  Teucrium  species have a long traditional use as well as different potential applications in pharmacy, food and beverage industry.  Teucrium  species are very rich in a variety of secondary metabolites with significant biological activities. Based on that, the book contains 15 chapters which discusses recent advances in exploring the unique features of  Teucrium species including morphology, systematics, taxonomy, biogeography, ethnobotany, phytochemistry, biological activity such as genotoxic, antioxidant, antibacterial, antifungal, antiviral, anticancer, anticholinesterase, antidiabetic and anti-inflammatory activity of secondary metabolites as well as applications includingcurrent challenges and further perspectives. Some medicinal  Teucrium  species in excessive use can cause certain consequences. This phenomenon and precaution is also described. Whilst this book is primarily aimed at scientists, researchers, beginners in the investigations of  Teucrium  species, graduate and post-graduate students in biology, botany, biotechnology, agriculture, and pharmacy, as well as science enthusiasts and practitioners involved in medicinal plants applications. Book provides complete Teucrium species list, color photographs of selected Teucrium species on natural habitats, as well as up-to-date bibliography related to  Teucrium  genus.