Among such exclusive medicinal plants, Costus speciosus (Koen ex.
Among such exclusive medicinal plants, Costus speciosus (Koen ex. Retz.) Sm. (syn. Cheilocostus speciosus, Family: Costaceae) is an ethnic antidiabetic plant which popularly known as ‘insulin plant’. C. speciosus is a perennial herbaceous ornamental plant known also as crepe ginger, kebu, keyu, kostam, kudavam, keomol, kemak, keyaful, kembu, kebuka, tara, kostam, kondige, penva, and pushkarmula (Pawar and Pawar, 2014). Despite its aesthetic value, it has great interest among the researchers all over the world for its traditional, medicinal, and pharmacological relevance.