Asperugo procumbens L. (N-, E- and C-Eur.) – A rare and ephemeral alien, much decreasing in recent times. Already recorded at the beginning of the 19th century (Durand 1899). By far most records are from the 2nd half of the 19th century and the beginning of the 20th century. Records since 1950 are scarce, for example: Bilstain (1954), Berchem (1956), Turnhout (1956) and Willebroek (2001). However, in the past years repeatedly seen in the Ghent port area (2011-2013).
Occurrences of Asperugo procumbens in Belgium are mostly associated with grain importation nowadays.
In the Netherlands Asperugo procumbens is locally more or less naturalized in coastal dunes (Weeda 1987).
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Selected literature:
Durand T. (1899) Phanérogames. In: De Wildeman E. & Durand T., Prodrome de la flore belge. A. Castaigne Editeur, Bruxelles: 1112 p.
Jansen L.J. (1988) Über eine Asperugo procumbens-Chenopodium foliosum-Gesellschaft im Kleinen Fleißtal/Goldberggruppe. Carinthia II 179: 383-389.
Persson A. & Ericsson S. (2009) Paddfoten Asperugo procumbens i Lövångers kyrkstad. ACtaea 1: 1-4. [available online at: http://www.sbf.c.se/vbf/ACtaea%202009%20Paddfot.pdf]
Rauchschwalbe H. (1980) Wiederfund des Scharfkrauts (Asperugo procumbens L.) am alten Standort in Fulda. Beiträge zur Naturkunde in Osthessen 16: 172-173.
Svensson R. & Wigren M. (1987) History and biology of Asperugo procumbens in Sweden (in Swedish). Svensk Bot. Tidskr. 81(6): 321-331.
Walter E. (1997) Das Scharfkraut (Asperugo procumbens L.) - eine seltene Balmenpflanze in Oberfranken. Bericht der Naturforschenden Gesellschaft Bamberg 72: 1-12.
Weeda E.J. (1987) Asperugo procumbens L., een 'archaïsch' onkruid in de duinstreek. Gorteria 13: 176-185.
Wiehle W. & Wollert H. (2002) Ein neues Vorkommen des Schlangenäugleins (Asperugo procumbens) in der Mecklenburgischen Schweiz. Botanischer Rundbrief für Mecklenburg-Vorpommern 36: 33-38.