Plant symbiosis

Sometimes when I walk around the neighbourhood, I see what I call "plant friends" - plants that seem to have established a friendly symbiosis with each other. There's an example of this just east of the southern end of North China Park. A very big tree in front of that blue house with purple trim seems to be something like a locust tree, with long compound leaves, but growing right out of it are well developed limbs of both a maple and something that appears to be a cherry tree.