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  • Onopordum
  • Italy Onopordum illyricum L. - Illyrian thistle, Illyrian cottonthistle - Mediterranean Onopordum leptolepis DC. (wikipedia.org)
  • Turkish thistle, Taurian thistle, Taurus cottonthistle, bull cottonthistle - southern + central Europe, Ukraine, Middle East Onopordum turcicum Danin - Turkey Onopordum wallianum Maire - Morocco Natural hybrids Onopordum × brevicaule (Onopordum acaulon × Onopordum acanthium ) Onopordum × erectum (Onopordum nervosum ssp. (wikipedia.org)
  • commonly
  • Although there has been a remarkable evolutionary and morphologic diversification in North American Cirsium , it has not been accompanied by very much divergence in the base sequences of genes commonly used to elucidate phylogenetic relationships. (efloras.org)
  • Cirsium vulgare l. (commonly known as bull thistle). (plna.com)
  • flower head
  • The terminal flower head is typical for thistles, a semi-spherical to ovoid capitulum with purple (seldom white or pink) disc florets. (wikipedia.org)
  • North American
  • This suggests either that the diversification has been very rapid or that genetic markers in North American Cirsium mutate more slowly than in most other lineages. (efloras.org)
  • Chromosomal diversification has accompanied the morphologic radiation of North American Cirsium . (efloras.org)
  • Among the North American thistles, however, is a mostly descending dysploid series with chromosome numbers ranging from n = 18 to n = 10. (efloras.org)
  • field
  • In other cases hybridization has been invoked without much evidence as an explanation for Cirsium variants encountered in herbaria or in the field. (efloras.org)