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Taxon author: (A. Gray) Petr.

ITIS records citing taxon author "(A. Gray) Petr."
 
 Kingdom Plantae
  Cirsium andersonii (A. Gray) Petr. -- accepted -- Anderson's thistle, rose thistle
  Cirsium arizonicum (A. Gray) Petr. -- accepted -- Arizona thistle
  Cirsium arizonicum var. arizonicum (A. Gray) Petr. -- accepted -- Arizona thistle
  Cirsium parryi (A. Gray) Petr. -- accepted -- Cloudcroft thistle, Gila thistle, Mogollon thistle, pale thistle, Parry's thistle
  Cirsium parryi ssp. parryi (A. Gray) Petr. -- not accepted -- Parry's thistle
  Cirsium rothrockii (A. Gray) Petr. -- not accepted -- Rothrock's thistle
  Cirsium wheeleri (A. Gray) Petr. -- accepted -- Wheeler's thistle
   

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