6. Geranium nodosum L. (mountains of S-Eur.) – A rare but locally naturalised escape from or relic of cultivation. Known since ca. 1851 from shady calcareous rocks in woodland in Roly (Bois Jean Mouton). Furthermore known from several, widely scattered localities in Wallonia, for instance Baudour, Bonneville, Modave, Rouillon, Tilff, Wépion (since 1931), etc. Duvigneaud & Saintenoy-Simon (1993) provide an update of its actual distribution in Belgium. Verloove (2002) further cites records from the surroundings of Brussels. Still frequently cultivated, in private gardens as well as in parks.
Geranium nodosum has very typical, pentagonal leaves. Nonetheless, it is frequently confused with other species of Geranium in Belgian herbaria, mostly with G. endressii and G. xoxonianum.
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Selected literature:
Duvigneaud J. & Saintenoy-Simon J. (1993) Le parc du château de Xhos à Tavier (prvince de Liège, Belgique) une belle station de plantes castrales. Nat. Mosana 46(3): 102-108.
Lawalrée A (1964) Geraniaceae. In: Robyns W. (ed.), Flore Générale de Belgique, vol. 4, fasc. 3. Jardin Botanique de l’Etat, Bruxelles: 239-286.
Verloove F. (2002) Ingeburgerde plantensoorten in Vlaanderen. Mededeling van het Instituut voor Natuurbehoud n° 20: 227 p.