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Cirsium arvense (L.) Scop.

Flora Europaea the original Linnean specimen perennial, G, 2n=34, diploid mesic to mesoxeric and hygrophyle, ruderal and segetal Palearctic Stellarietea mediae, Scleranthion annui, Onopordion, Epilobietea angustifolii, Chenopodio-Scleranthetea, Nanocyperion, Artemisietea R87 habitats, invading also many other types from the steppe up to the subalpine belt as a consequence of ruderalization       The most common ruderal and segetal thistle in the whole world with a very vigorous aggressive vegetative reproduction. Gruia Hill on the plateau, Cluj-Napoca, Cluj county, June 2005. dr. Alexandru Badarau, alexandru@transsilvanica.net Nima, Cluj county, 1st of September 2009 dr. Alexandru Badarau, alexandru@transsilvanica.com