Cirsium horridulum Michx.  
Family: Asteraceae
Yellow Thistle
[Carduus vittatus,  more]
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Jeffrey S. Pippen, http://www.duke.edu/~jspippen/nature.htm  
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Ted Bodner @ USDA-NRCS PLANTS Database / Miller, J.H. and K.V. Miller. 2005. Forest plants of the...  
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Plant Resources Center of the University of Texas at Austin  
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Jeffrey S. Pippen, http://www.duke.edu/~jspippen/nature.htm  
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Jeffrey S. Pippen, http://www.duke.edu/~jspippen/nature.htm  
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Steve Hurst @ USDA-NRCS PLANTS Database  
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Michaux, Andre. Flora boreali-american :sistens caracteres plantarum quas in America septentrionali  
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Britton, Nathaniel Lord and Addison Brown. An Illustrated Flora of the Northern United States, Cana  
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Walter, Thomas. Flora caroliniana: secundum systema vegetabilium perillustris Linnaei digesta... p  
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Kathy M. Davis, University of Florida Herbarium  
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Kathy M. Davis, University of Florida Herbarium  
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This project made possible by National Science Foundation Award 1410069