Hawthorn can be identified close up by its ragged-edged, indented leaf.
Once you have been able to identify each of the above from close up, you can recognise them from farther away by their jizz. No, it's not a rude word; it's a technical term that means the general size, shape and colour. Part of the jizz of all these trees (especially carob) is that the leaves only start to grow above goat height, i.e. the height that a goat can reach standing on its hind legs (about 5 feet).