Silene chalcedonica (L.) E.H.L. Krause (syn.: Lychnis chalcedonica L.) (Russia) – A very rare, probably ephemeral escape from cultivation. Recorded on a railway bank near a military camp in Brasschaat (Polygoon) in 1954. More recently also seen in Boom (2002) and Zottegem (2013). In 2006 Silene chalcedonica was seen near Sint-Pietersberg in a rather remote and natural habitat.
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