Lepidium didymum L. (syn.: Coronopus didymus (L.) Smith) (S-Am.) – A common, widely naturalised and still increasing alien. First recorded in 1857 close to the Botanic Garden of Gent and subsequently in several different, widely scattered localities. Sometimes temporarily persisting but not really naturalising at that time. According to Lawalrée (1956) still ephemeral in the first half of the 20th century. Much increasing since the 1980’s, especially in Flanders (although much rarer in its eastern part) (Van Landuyt 2006a). In Wallonia chiefly confined to the northern part and mostly absent from the Ardennes.
Lepidium didymum usually grows in damp, nitrophilous locations: arable land, waste land, margins of ponds,… It sometimes penetrates in more or less natural habitats but has never been regarded as a noxious invader.
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Selected literature:
Lawalrée A (1956) Cruciferae. In: Robyns W. (ed.), Flore Générale de Belgique, vol. 2, fasc. 2. Jardin Botanique de l’Etat, Bruxelles: 160-285.
Van Landuyt W. (2006a) Cardaria draba. In: Van Landuyt W., Hoste I., Vanhecke L., Van den Bremt P., Vercruysse W. & De Beer D., Atlas van de flora van Vlaanderen en het Brussels gewest. Instituut voor Natuur- en Bosonderzoek, Nationale Plantentuin van België en Flo.Wer: 226.
Yannitsaros A. (1974) Studies on the adventive flora of Greece, 2. Coronopus didymus (L.) Smith (Cruciferae) (in Greek). Biol. Gallo-Hellenica 5: 285-308.
Yannitsaros A. (1986) New data on the naturalization and distribution of Coronopus didymus (Cruciferae) in Greece. Willdenowia 16(1): 61-64.