Sisymbrium loeselii L. (E-Eur., W and C-As.) – A rare, locally naturalised alien. Apparently first collected at the railway station in Quaregnon in 1872 but soon recorded in several different other localities. Mostly strictly ephemeral but sometimes more or less persisting for some time, for instance in Aarschot, Genk (Waterschei), Oud-Turnhout, Sint-Job-in-‘t-Goor,… In the past decades well-documented from gravel pits around Tournai (Querel 1994, 1995). Also locally more or less established in some parts of the port areas of Antwerpen and Gent. Many records of Sisymbrium loeselii are obviously related with grain importation (still regularly seen around grain mills). Formerly also associated with wool. At present Sisymbrium loeselii is most often seen on waste land, foot of walls, etc.
Queyrel A.-M. (1994) Nouvelles observations dans les sites carriers du Tournaisis. Adoxa 3: 10.
Queyrel A.-M. (1995) Matériaux pouvant servir de complément à l’Atlas et observations annexes en Tournaisis. Adoxa 8: 27.