I've lived in my house many years and have always enjoyed this bush/tree plant in the front that looks a lot like an apple tree (blossoms, leaves). It has clumps of little green berries (I'm sure not edible) but also every so often produces a couple of apples. what the heck? I've (carefully) eaten one or two of the apples and they seem just like regular old apples. But why are there clumps of green berries (multiple, on little stalks, like cherries grow, only much smaller than cherries). I was just pruning it today and noticed there are a couple of apples on it. But the little green berry things are confusing me. Is this thing grafted? I live in the Pacific Northwest. Any idea what this shrub is?
Additional photos are at http://imgur.com/a/pwBaG.
Click on photos for larger view.