Herb Robert

In traditional herbalism, Herb Robert was used as a remedy for toothache and nosebleeds. Freshly picked leaves have an odor resembling burning tires when crushed, and if they are rubbed on the body the smell is said to repel mosquitoes. The active ingredients are tannins, a bitter compound called geraniin, and essential oils. It was carried to attract good luck, and due to its analogical association with storks, to enhance fertility.
http://en.wikipedia.org/wiki/Geranium_robertianum