Euphrasia diekjobstii is a small-flowered taxon related to Euphrasia stricta, which is widespread but seems to have a particular concentration in North Rhine-Westphalia. As early as 1893, it shall have been separated as Euphrasia parviflora WETTST., but this name was invalid, since there was an another Euphrasia parviflora FR. existing before. So G.H.LOOS made another attempt to describe it as Euphrasia diekjobstii in 2010 in the 'Jahrbuch des Bochumer Botanischen Vereins für das Jahr 2009 - Band 1' page 120f. However, this description is invalid, too, because as a new name (nomen novum) of an invalid name there is an inconsistency in the mention of the source, and for a new description (nova species), which was certainly not contemplated, the Latin diagnosis and type specimen are lacking.