This name is a synonym of Crataegus oxyacantha f. plena (Weston) Rehder.
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 18723) with original publication details: Botanicus universalis Botanicus universalis; 1770 78 1770.
This name record (from RJP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Crataegus oxyacantha in version 1 of The Plant List.