An Etymological Dictionary of the German Language/Annotated/Lolch
Lolch, masculine, ‘darnel,’ from the equivalent Middle High German lulch, lullich, lulche, masculine; the Old High German word is wanting, therefore it is difficult to determine when the term was borrowed from the equivalent Latin lolîum. It is also conceivable that the German word is independent of the Latin, especially as the former is lengthened by a guttural.