Clematis recta L. (C Eur., As.) – A very rare escape from cultivation. First documented from 1834 in Habay-la-Vieille. Formerly naturalized in a single locality (Fraipont) where its presence was confirmed at least between 1936 and 1965 (Le Pas 1965). In this locality C. recta grew in abundance on a north-facing slope close to the cemetery, from where it probably escaped. The plants grew on the verge of a railway siding and probably disappeared after infrastructural works. It was furthermore documented from Heusy, also in the valley of river Vesdre.
Selected literature
Brouland M. (1975) Recherches sur la structure du sac embryonnaire et sur les phénomènes de fécondation chez la Clematis recta L. Botaniste 57(1-6): 5-14.
Hodvina S. (2012) Letzte Nachweise der in Hessen ausgestorbenen oder verschollenen Pflanzenarten: Ergebnisse einer Literatur- und Herbarauswertung. Botanik und Naturschutz in Hessen. Beiheft. 11: 341 p. [available online at: http://www.bvnh.de/bnh/]
Le Pas J. (1965) Trouvailles floristiques: Clematis recta à Fraipont. Nat. Mosana 18(4): 138-139.