This name is unresolved.
The record derives from RJP (data supplied on ) which does not establish this name either as an accepted name or as a synonym (record 18998) with original publication details: Nomenclator botanicus Nomenclator botanicus; 1840 433 1840.
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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 nigra in version 1 of The Plant List.