This name is a synonym of Ulmus mexicana (Liebm.) Planch..
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Vidensk. Meddel. Naturhist. Foren. Kjøbenhavn 1850: 77 1850.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:851214-1.
This name was in version 1 of The Plant List, record kew-2714439.