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Results of: Search in every Kingdom for Scientific Name containing 'Cirsium horridulum'
 
 Kingdom Plantae
  Cirsium horridulum Michx. – accepted – yellow thistle
  Cirsium horridulum var. elliottii Torr. & A. Gray – not accepted
  Cirsium horridulum var. horridulum Michx. – accepted – yellow thistle
  Cirsium horridulum var. megacanthum (Nutt.) D.J. Keil – accepted
  Cirsium horridulum var. vittatum (Small) R.W. Long – accepted – yellow thistle
   

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