Tanacetum macrophyllum (Waldst. et Kit.) Schultz-Bip. (syn.: Chrysanthemum macrophyllum Waldst. et Kit., Pyrethrum macrophyllum (Waldst. et Kit.) Willd.) (SE-Eur., SW-As.) – A rare and usually ephemeral escape from cultivation or garden throw-out (sometimes temporarily persisting locally or more or less naturalised). Probably first seen in Battice (Chapelle-aux-Bruyères) in 1882 where it was naturalised in abundance (Durand 1882). Seen until at least 1909 but doubtlessly gone now. Furthermore discovered in 1886 on an off-ramp in Soiron, persisting at least until 1945 (here initially introduced on purpose). Also said to be naturalised on an off-ramp in Lambermont around 1907. In the past decades apparently much rarer. Collected for instance on wasteland in Brussel (Heyzel) in 1960. Recently also introduced along a disused railway track near Zonhoven (at nature reserve De Teut) and very persistent (along with Astrantia major, Telekia speciosa, Thalictrum aquilegiifolium,…). In 2011 furthermore seen in nature reserve Damvallei in Heusden (Destelbergen).
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Selected literature:
Delaigue J. (2001) Tanacetum macrophyllum (Waldst. et Kit. Schultz Bip. (Asteraceae), plante nouvelle pour la France, dans le massif du Mont Pilat. Bull. Mens. Soc. Linn. Lyon 70(4): 93-103.
Durand T. (1882) Découvertes botaniques faites pendant l’année 1882. Bull. Soc. Roy. Bot. Belg. 21(2): 119-127.
Walter E. (1986) Die Großblättrige Wucherblume (Tanacetum macrophyllum) und ihre Verbreitung in Nordbayern. Bericht der Naturforschenden Gesellschaft Bamberg 61: 1-12.