This "lovely" convolvulus is in fact a garden escape, as is probably most of the bindweed around our area. The plant in the photo is C. althaeoides subsp. tenuissimus. It was planted in our old perennial border, and has survived to spread down the sunny bank adjacent to our Garry Oak meadow. I grow a small piece of this in the Europe section of the E.H. Lohbrunner Alpine garden. Whenever it pops up where I don't want, it gets pulled at ground level. So far, this seems to control it.