Thlaspi alliaceum L. (C and S-Eur., W-As.) – A very rare and usually ephemeral alien. Already recorded, without further details, in the first half of the 19th century. Found as a grain alien under a crash barrier in Pittem in 1993 (Verloove & Vandenberghe 1995). Discovered in relative abundance along a former railway track in Froidchapelle in 2007 (Lannoy 2007). Still present in 2008 and 2009 but now gone (comm. M. Lannoy, 2012). In 2013 also discovered in Aublain (two populations, one of which with about 100 plants). In this locality this species looks more or less established; it is found on rough ground near farms and in adjacent meadows.
In parts of North America Thlaspi alliaceum is considered a rapidly spreading invasive weed (Cusick 2015).
Selected literature:
Bregant E. & Melzer H. (1985) Ein Fund des Lauch-Taschelkrauts (Thlaspi alliaceum L.) in der Steiermark. Notizen Flora Steiermark 7: 11-14.
Cusick A.W. (2015) Thlaspi alliaceum L. (Brassicaceae): An Exotic, Invasive Annual Rapidly Spreading in Pennsylvania, Together with the First Collections of This Species in North America. Castanea 80(1): 43-44.
Deschâtres R., Dutartre G. & Lamaison J.L. (1994) Apparition massive de Thlaspi alliaceum L. en region Auvergne et dans le Lyonnais. Monde Pl..451: 13-15.
Dörr E. (1995) Anhang zu Thlaspi alliaceum. Ber. Bayer. Bot. Ges. 65: 169-170.
Eberlein F. (1996) Thlaspi alliaceum L. am Fuss des Högls im Landkreis Berchtesgaden. Ber. Bayer. Bot. Ges. 66-67: 313.
Hofbauer W. (2005) Erstfund des Archaeophyten Thlaspi alliaceum L. für Nordtirol sowie neue Fundortangaben zu diversen Neophyten. Ber. nat.-med. Verein Innsbruck 92: 45-53. [available online at: http://www.landesmuseum.at/pdf_frei_remote/BERI_92_0045-0053.pdf]
Lannoy M. (2007) Thlaspi alliaceum, une adventice en migration…dans le Sud du Hainaut! Adoxa 57: 3-6.
Rich T. (1989) Thlaspi alliaceum L. in Ireland: a retraction. Irish Naturalists' J. 23: 121.
Springer S. (1995) Thlaspi alliaceum L. im Unterallgäu. Ber. Bayer. Bot. Ges. 65: 167-169.
Thieret J.W. & Baird J.R. (1985) Thlaspi alliaceum (Cruciferae) in Kentucky and Indiana. Trans. Kentucky Acad. Sci. 46(3/4): 145-147.
Thompson R.L., Poindexter D.B., Rivers Thompson K. & Threadgill P.F. (2013) Thlaspi alliaceum (Brassicaceae) naturalized in Georgia, Missouri, and North Carolina. Phytoneuron 2013-86: 1-13. [available online at: http://www.phytoneuron.net/2013Phytoneuron/86PhytoN-Thlaspialliaceum.pdf]
Verloove F. & Vandenberghe C. (1995) Nieuwe en interessante voederadventieven voor de Belgische en Noordfranse flora, hoofdzakelijk in 1994. Dumortiera 61-62: 23-45.
Wolff P. (1985) Thlaspi alliaceum L. in der Pfalz. Tuexenia 5: 99-105.
Wurzell, B.S. (1994) Pennies from Maldon. BSBI News 66: 32-33.