Abstract :Abstract
Plant biodiversity which is bestowed with immense chemical diversity has been the richest source of drugs. Chemical composition and molecular structure studies greatly enable possibility of new molecules for drug formulation. Thus, newer approaches like chemoprofiling using sophisticated analytical techniques and bioactivity determinations are needed that can result into new biomolecules. Valeriana species with cosmopolitan distribution are the source of important phytomedicines for curing nervous unrest and emotional troubles. These possess variety of bioactive sesquiterpenoids and valepotriates. Nepeta species are known for the presence of different isomeric nepetalactones, irododial derivatives and structurally related compounds. Tanacetum nubigenum exists in two chemically distinct chemotypes.