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Erigeron canadensis L.

Flora Europaea the Linnean original specimen biennal, TH, 2n=18, diploid mesoxeric to mesic, strictly opportunistic ruderal Nearctic steppic Sisymbrion, Artemisietea, Chenopodietea, Corynephoretea, Brachyaction ciliatae, Stellarietea mediae, Atropetalia R87 habitats       One of the most common ruderals which reached Europe in 1655; in Romania it became a common ruderal even at the beginning of the XIXth century (1814). Nima, Cluj county, August 2009 dr. Alexandru Badarau, alexandru@transsilvanica.com