This contributed volume provides a comprehensive, in-depth and subject-based reviews on the current status of active ingredients, sustainable use, biodiversity and conservation of certain endangered medicinal plants. The book also explores conventional and non-conventional biotechnological interventions for their biodiversity conservation. Medicinal plants have been used in worldwide as a major source of raw material for the traditional herbal healthcare practices as well as for drug discovery and development in pharmaceutical industry. The cumulative consequences of various human activities and environmental factors cause decline in the biodiversity of medicinal plants at an unprecedented rate worldwide. Thus, the overall understanding of ecology, species and genetic diversity along with assessment of the status of different threats and their impact on medicinal plants is crucial to sustain existing biodiversity, its utilization and conservation. All the latest advancements in the biotechnological approaches for the conservation research of endangered medicinal plants and the future perspectives have been described. This book provides comprehensive reviews spreading over about 25 chapters divided in three sections. The chapters of this book are written by recognized scientists in their respective fields which are useful to students, academicians, researchers, botanists, biotechnologists, policy makers, conservationists and industries interested in biodiversity conservation and medicinal plant research for the production of secondary metabolites.