Herbal drugs represent a major allocation of all the recognized systems of health in the world. Also, the medicinal plants have been regarded as valuable and cheap sources of various phytoconstituents which are used extensively in the development of drugs against various diseases. Number of phytochemical constituents have been found to be associated with the drug such as unsaturated fatty acid, terpenoid and flavonoids. The book has been designed to elucidate data on phytochemistry and pharmacological activities associated with Decalepis hamiltonii Wight and Arn, Coriandrum Sativum Linn andAnnona Reticulata Linn.