Medicinal plants, have been the chief source of drugs used in treatment of various ailments. It is observed that the position of medicinal plants is not the same as in Samhitas. There is a lot of addition of new synonyms and also recording of new observations in terms of actions and uses. Thus, it would be interesting to study such developments in case of each drug historically and scientifically under the heading of 'The Historical Biography', covering the entire life of a medicinal plant along with various changes taking place from time to time.