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Isatis tinctoria L.

Flora Europaea the original Linnean specimen         An invader (but not due to ruderalization) especially in xeric and mesoxeric grasslands which was widely cultivated in Europe during the Middle Age a source of a blue paint. It is said to be native to SW Asia with some local subspecies in Greece and Krym. In the arid steppes from North America since the 60s of the XXth century this invasive plant became an ecological calamity. Cheile Valisoarei natural reservation area, Trascau Mountains, Alba county, 23rd of May 2010. Adrian Macavei, adi_m_bn@yahoo.com