Hoe donkergroen of obscuur is Epilobium obscurum?

How obscure is Epilobium obscurum? – There are indications that Epilobium obscurum is often overlooked or misidentified by Belgian botanists (especially mistaken for E. tetragonum). This contribution describes and illustrates its distinguishing features (elongated stolons, glandular hairs on the calyx, relatively short capsules) and questions the accuracy of the Dutch, French and German vernacular names of the species.