The genus Mentha Features a number of medicinal herbs, including two with a long curative history: Spearmint (M. Spicata) and peppermint (M. Piperita). Typically mints have square stems and green serrated leaves, and produce delicate pinkish or lavender flowers. As culinary herbs, they mix well with other salad greens and make a pleasant, soothing tea. Mints act as appetite stimulants and palate cleansers, calm indigestion and heartburn, relieves the nausea of motion sickness, and ease the pain of headaches when applied to the forehead. Their pungent odor can clear up the congestion and coughing of colds or flu; for asthmatics, mint also acts as a relaxant.