3. Rumex dentatus L. (SE-Eur., N-Afr., subtrop. As.) – A very rare and much decreasing, always ephemeral alien. First recorded in 1891 in Huy (grain alien), subsequently in 1904 as a wool alien in the Vesdre valley. Last seen in 1954 in Andrimont as a grain alien.
An exceedingly variable species. Lousley & Kent (1981) and Karlsson (2000) provide information for the separation of the six subspecies of Rumex dentatus (largely based on Rechinger (1932). The exact identity of the Belgian collections has not been studied so far (Lawalrée 1953a).
Selected literature:
Karlsson T. (2000) Polygonaceae. In: Jonsell B. (ed.), Flora Nordica, vol. 1. The Bergius Foundation, Stockholm: 235-318.
Lawalrée A (1953a) Polygonaceae. In: Robyns W. (ed.), Flore Générale de Belgique, vol. 1, fasc. 2. Jardin Botanique de l’Etat, Bruxelles: 237-305.
Lousley J.E. & Kent D.H. (1981) Docks and knotweeds of the British Isles (BSBI Handbook n° 3). BSBI, London: 205 p.
Rechinger K.H. (1932) Vorarbeiten zu einer Monographie der Gattung Rumex, 1. Beih. Bot. Centralbl. 49(2): 1-132. [available online at: https://bibdigital.rjb.csic.es/medias/cc/ee/f4/04/cceef404-7670-4c2a-aec...