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It is a mallow, Lavatera.
There are several species and many cultivars, so it is difficult to ID yours fully.
If I had to guess, I'd lean towards L. arborea (http://en.wikipedia.org/wiki/Lavatera_arborea) or L. trimestris (http://www.outsidepride.com/seed/flower-seed/rose-mallow/rose-mallow-loveliness.html).
But appearance can vary a lot depending on the cultivar.
Mallow is related to hollyhock, Hibiscus, okra, Abutilon., prairie mallow (Sidalcea).
Note: 'mallow' covers plants in both Lavatera and Malva; they are very similar.