There's a weird tree/shrub behind my house that has eluded identification. It looks like a mountain ash crossed with a pin cherry. Smooth bark, non serrated leaves, but berries that resemble tiny cherries. The berry flesh is white, extremely bitter, and contains four pale seeds. There is a mountain ash right next to it, which I assumed they were the same until they started fruiting. Any ideas? I've chekcked all my field guides, online resources, etc with no luck. Even locals think we are making it up. I'm going to try on the Arborist forums as well.