Crepis tectorum L. (Eur., C-As.) – A rather rare and much decreasing, usually ephemeral alien. Apparently first collected in 1842 near Brussel. In the 2nd half of the 19th century regularly recorded as a weed of arable land (more rarely on waste land, old walls, etc.). Sometimes temporarily persisting (e.g. Destelbergen, between 1858 and 1864). In the 20th century much rarer (for instance in Sint-Amandsberg in 1924). From the 1970’s onwards more regularly seen, especially in the Kempen (Arendonk, Lichtaart, Ravels, Turnhout) but probably always ephemeral (most records are near grain mills). In 1973 also recorded in quantity on a former coal mine heap in Zwartberg. In the past years (since 2008) repeatedly seen by unloading quays for cereals and by roadsides in the port areas of Antwerpen and Gent. Possibly overlooked elsewhere.
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Selected literature:
Andersson S. (1989) Phenotypic plasticity in Crepis tectorum (Asteraceae). Pl. Syst. Evol. 168: 19-38.
Andersson S. (1990) A phenetic study of Crepis tectorum in Fennoscandia and Estonia. Nordic J. Bot. 9: 589-600.
Andersson S. (1991) Geographical variation and genetic analysis of leaf shape in Crepis tectorum (Asteraceae). Pl. Syst. Evol. 178: 247-258.
Grenfell A.L. (1986) Adventive News 33. BSBI News 42: 16-19.
Sennikov A.N. (1999) Race-formation in the Crepis tectorum group. Komarovia 1: 79-84.
Van Landuyt W. (2006) Crepis tectorum. 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: 319.