Ok, assuming it is an Ash tree, how long would it need to grow before it could be identified? I pulled up hundreds of these today (I saw no seeds on any of them, but at the time I was not looking but if any of them had a seed attached I never saw one). I pulled all the Cleome plants but just a few, and I transplanted a few also. I pulled all the little tree looking plants but one clump which I left in case it turned out to be something I wanted. If it is agreed they are indeed little trees I will go ahead and pull them, I don't need any tall trees growing under the power lines.
