This shrub has been growing in the back yard for many years. If it is left unpruned for a few years (which is not a good idea!) it produces the fruit that give it the name quince. My next-door neighbour used to make a nice jelly from the fruit -- it is basically inedible directly from the bush. Now that it is pruned every year it still produces lots of beautiful flowers in the late winter and early spring, but very little fruit.
We used to call it "Quince Japonica", but the Wikipedia article en.wikipedia.org/wiki/Chaenomeles makes me think that this is really "Chinese Flowering Quince", i.e. chaenomeles speiosa, based on the size of the fruit.