Pharmacognostic studies on Plectranthus amboinicus Lour

Plectranthus amboinicus Lour. (Lamiaceae) has got high reputation in traditional medicinal practice for its remarkable medicinal properties. The entire plant, especially the leaves are recognized as valuable drugs and frequently used by many ancient physicians. The present paper highlights the exomorphology and histomorphology of leaf, petiole, stem, root and phytochemical study of the whole plant. These observations will enable to standardize the botanical identity of the drug in crude form.