Tanacetum balsamita L. (syn.: Balsamita major Desf., Chrysanthemum balsamita (L.) Baillon) (SW-As.) – A very rare and ephemeral garden escape or garden throw-out. First recorded in 1941 along a railway track in Chokier. Subsequently seen in Châtelet (1948), Diegem (1983) and Hologne-sur-Heer (1989). Most recently observed in Bure (Tellin) in 2016. Apparently much decreasing in cultivation nowadays.
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