This name is a synonym of Crataegus lassa var. integra (Nash) R.W. Lance.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50085339) with original publication details: Bull. Torrey Bot. Club 22(4): 150 1895.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:68295-2.
This name was in version 1 of The Plant List, record tro-50085339.