There were only 2 plants listed in The Morton Arboretum online catalog.  They were together on the conifer walk at F-51/25-95 and F-52-25-10. (One of these was removed during Winter 2012-2013). Pinus aristata is slow growing, and long lived. although these two are small, the tags indicate that they are more than 65 years old.

On occasions when I have photographed these trees they have been partly or totally shaded by the nearby White pine.