2. Iberis sempervirens L. (Medit.) – A very rare escape from cultivation or garden throw-out but probably slightly increasing lately. Locally naturalized or at least persisting for quite some time. Probably first recorded in Lambermont in 1912 on waste land. Also reported recently from coastal dunes near De Panne (one big patch in 1997 in nature reserve Houtsaegherduinen but possibly gone by now). Cited by Duvigneaud (1988) from old walls in Houx. In the past years also repeatedly seen in urban areas, close to (former) plantations. However, Iberis sempervirens is by far best known from calcareous grassland at the Tienne Breumont in Nismes. There known since at least 1979 and regularly confirmed (most recently in 2011). A small population of ca. 10 plants thrives well in a more or less disturbed part of the grassland (comm. P. Dupriez).
Iberis sempervirens is still frequently cultivated in Belgium but seems to escape very rarely. Perhaps poorly known and under-recorded or neglected in Wallonia.
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Selected literature:
Duvigneaud J. (1988) La réserve naturelle domaniale de Poilvache à Houx (Yvoir). Mise en évidence de sa vocation didactique. Nat. Mosana 41(4): 113-136.