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Relationships among Cynara species and within C. cardunculus revealed by rDNA spacers parsimony analysis, redrawn from Sonnante et al. (2007). Abbreviations for the Cynara cardunculus clade: Sylv = var. sylvestris; Alt = var. altilis; Scol = var. scolymus, followed by geographic origin (Sylv and Alt) or varietal group (Scol).
