Athurveda, Charak Sangita, Sushrut, Sanghita have given an excellent account of medicinal plants. A number of books on medicinal plants known as herbals were written by various herbalists (Fucus, Cordus, Lobel etc.). India was the leading country in the study of medicinal plants before sixteenth century. Withania somnifera L. (Dunal.) and Tephrosia purpurea L. (Pers) occupy a reputable position in India pharmacology. Both these species enjoy considerably therapeutic repute in Ayurvedic, Homeiopathic, Unani and Allopathic systems of medicine. It was concluded that such studies may be useful to further the domesticational and cultivational research on medicinal plants. Ayurveda is the oldest scientific system of medicine in the world. The objectives of Ayurveda are primarily related to human health and longevity. Every plant has potential to generate energy. Many a herb are used for treatment of diseases, revitalization sp. vitalizer, aphordisiac and other purposes. Minerals and animal products are also used as medicines in Ayurveda but herbal us is considered to be the most important.