Sisymbrium runcinatum Lag. ex DC. (SW-Eur., N-Afr., W-As.) – An exceptional and ephemeral alien. Recorded only once on a railway yard in the port of Gent in 2004, along with numerous other grain aliens.
A very similar species, Sisymbrium polyceratium L., recently became more or less naturalised near Paris and seems to be on its way to Belgium (Lombard 2009).
Selected literature:
Lombard A. (2009) Résultats d’herborisations en banlieue parisienne à Ivry-sur-Seine (Val-de-Marne) et ses environs. Monde Pl. 497: 5-11.
Taxonomic name: