Lysimachia ciliata L. (syn.: Steironema ciliatum (L.) Baudo) (N Am.) – A very rare and ephemeral escape from cultivation or throw-out. Recorded in 2012 on levelled soil in Erpe-Mere (‘Firecracker’, a purplish-leaved cultivar).
This species was locally more or less naturalized in the 19th century in Belgium. According to Durand (1899) it was already known around 1811 and was known to occur in shady, damp habitats (mostly ditches), especially in the surroundings of Verviers (Limbourg, Ensival, Theux, Nessonvaux). Furthermore recorded in Fraipont, Jeliveaux (Olne), Gelrode and Stuivekenskerke, apparently for the last time in 1886 (Verloove 2006).
Lysimachia ciliata has become rare in cultivation and is not really garden worthy (see also Clement 1982).
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Selected literature:
Clement E.J. (1982) Confusion between Lysimachia ciliata and L. punctata. B.S.B.I. News 31: 23. [available online at: http://archive.bsbi.org.uk/BSBINews31.pdf]
Durand T. (1899) Phanérogames. In: De Wildeman E. & Durand T., Prodrome de la flore belge. A. Castaigne Editeur, Bruxelles: 1112 p.
Gill L.S. (1971) Chromosome number of Lysimachia ciliata L. Rhodora 73(796): 556-557.
Verloove F. (2006) Catalogue of neophytes in Belgium (1800-2005). Scripta Botanica Belgica 39: 89 p. [available online at: http://alienplantsbelgium.be/sites/alienplantsbelgium.be/files/tabel_2.pdf]