Writing this thesis was purely my research work. Of course I have gone through the book. Title "RARE ENDANGERED AND THREATENED (RET) SPECIES OF MEDICINAL PLANTS OF KORIA DISTRICT IN HHATTISGARH (INDIA)" Extinct species is no longer found in the world. Endangered or threatened species is one whose number has been reduced to a critical number. Unless it is protected and conserved, it is in immediate danger of extinction. Vulnerable species is one whose population is facing continuous decline due to habitat destruction or over exploitation. However, it is still abundant. Rare species is localized within a restricted area or is thinly scattered over an extensive area. Such species are not endangered or vulnerable. A critical evaluation of the 200 Taxa data sheets reveals that a regional status of the Red List categories of medicinal plants sampled in the present investigation may be very well prepared. This text has been prepared keeping in view the requirement of student and researchers in different degree awarding Universities /Institutes. I am optimistic that this book will finally achieve the objectives of its publication.