This name is a synonym of Crataegus coccinea var. indentata Lodd. ex Loudon.
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 18785) with original publication details: Catalogue of plants Catalogue of plants; 1830 41 1830.
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 indentata in version 1 of The Plant List.