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ICN (Hand, R., Kilian, N. & Raab-Straube, E. von; general editors) 2009- (continuously updated): International Cichorieae Network: Cichorieae Portal. Published on the Internet at http://wp6-cichorieae.e-taxonomy.eu/portal/Archived 2009-10-22 at the Wayback Machine; accessed 5 Nov 2010