cannabis

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• - A publication of Southern Illinois University Herbarium by Ernest G. Walker, Jr. on Cannabis sativa, Cannabis indica, and Cannabis ruderalis. With references.
  
• - Cannabis sativa L. hemp, Indian hemp.
  
• - Information from the USDA Plants database.
  
• - Image from Botanical Department - University of Catania.
  
• - By Ernest Small and David Marcus. Reprinted from: Trends in new crops and new uses. 2002. p. 284–326. J. Janick and A. Whipkey (eds.). ASHS Press, Alexandria, VA. One of the best documents about Cannabis on the Web. (PDF file 14.1MB)
  
• - Harvard University Flora Online. Includes description, line drawings, and U.S. distribution map.