Echinacea Extract CasNo.: 90028-20-9 is a renowned traditional herbal remedy for treating a variety of ailments. Native to areas east of the Rocky Mountains in the United States, as well as the western states, Canada and Europe, several species of the echinacea plant are used to make medicine from its leaves, flower and root. The herb fell out of favor with the discovery of antibiotics, but it’s now making a comeback.