This name is a synonym of Ulmus americana L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 33300188) with original publication details: Rhodora 47(556): 133 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:259363-2.
This name was in version 1 of The Plant List, record tro-33300188.