In De Gorter’s Flora VII Provinciarum, 1781, a number of species are mentioned, of which it is very unlikely that they have ever been found in the Netherlands. By means of a small herbarium, collected by Rainviixe, a botanist often cited by De Gorter, we were able to rectify a number of these doubtful records. The herbarium is preserved in Teyler’s Museum, Haarlem, and was collected about the middle of the 18th century. It mainly contains members of the families Cyperaceae, Gramineae, and Juncaceae. The dubious names used by De Gorter, and our rectifications are to be found in the two lists at the end of the present paper. Moreover some incorrect interpretations by Van Hall, based on the same collection, and mentioned in his Flora Belgii Septentrionalis, 1825, have been adjusted.