The Winged Elm is easy to identify by the two cork-like ridges that grow along the branches and twigs. The word "alata" is Latin meaning winged, hence the scientific name. The winged elm that you see in the arboretum was not original to this location but was more than likely a wayward seed being that they are very easy to propagate by seed.
Courtesy of USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 627.