If you pick a plant with a distinctly square stalk and simple, opposite leaves, then it is very likely a member of the Mint family. Be sure to smell it too, since many species of the family are loaded with aromatic volatile oils. Some mints include Basil, Rosemary, Lavender, Marjoram,Thyme, horehound, and Horehound to name a few!
Medicinally this family is rich in volatile oils, especially menthol, often used as the penetrating vapors in cough drops. These spicy oils are stimulating and warming, causing the body to open up and sweat; so most of these plants are listed as diaphoretic in herbal books. This property can help you break a fever. A fever is the body's way of "cooking" the microorganisms that cause infections. Using a diaphoretic herb can help raise a mild fever just high enough to "cook" a virus, thus "breaking" or ending the fever. Volatile oils are also highly lethal to microorganisms
For more information on natural health and wellness go to http://ancestralmedicinals.com