No idea what's the name of this plant ... but I love the rich red color of it's flower. It's also the same shot as the one currently on my header. :)
I have seen this plant in some of the gardens around the area, though not so much since this plant has the tendency to overcome your space, if you let it. It also needs trimming every now and then; the red color on the flowers just really got to me and my sister that's why she decided to get one for her garden.