This name is a synonym of Crataegus chlorosarca Maxim..
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 18691) with original publication details: Sp„th Catalogue Sp„th Catalogue; 1720 90 1905.
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 schroederi in version 1 of The Plant List.