Purple Flower

I think this is the Pelargonium graveolens. See if you agree...(you can see your plant better than me to compare them)

http://commons.wikimedia.org/wiki/Image:Pelargonium_graveolens.jpg

Not to be confused with the household variety of geranium, which is a completely different species. (which would explain why they don't stink) Pelargoniums' are native to South Africa, and the Sotho used a paste made from the leaves to treat wounds and abscesses. A decoction from the root is used by the Sotho to wash feverish patients.