During the 2014 growing season, the tree grew like crazy. The person I purchased it from had thought it was a Cedar Elm (and it still may be), but when I saw the incredible wings that expanded on the new growth I suspected it was alata.
Here it is during the 2014 growing season.
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As you can see there is nearly 3' of new growth on the leader. And look at the wings that formed -
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Cedar elm and Winged elm are often confused. Here's what I understand - Cedar Elm (Ulmus crassifolia) is one of only two native elms that flower in the fall. The rest are spring flowering elms. So if your tree flowers in the fall it's for sure a Cedar Elm - they can also develop wings. The only other one that does is the September Elm (Ulmus serotina) and it's very rare and there are no wings. All of the other native elms flower in the spring. So Cedar Elm do not hybridize as other elms do as they flower out of season with other native.
Also, crassifolia is from the Latin crassus meaning "thick". The bottom of the leaves are supposedly rough when they harden off. But I've never found that to be especially diagnostic.
If it's truly a Winged Elm (Ulmus alata) it flowers in the spring. It should develop thick wings on vigorous new growth. Wings that develop on trees that I know are Cedar elm tend to appear kind of gray in color and aren't so large. The bark on this tree also look different than trees I know are Cedar elm. I've never seen this tree flower so I don't know for sure, but I suspect it's a Winged elm.