title: Fagopyrum cymosum
text: # Fagopyrum cymosum
  
  Fagopyrum cymosum, also known as tall buckwheat, is a domesticated plant used in traditional Chinese medicine, for animal feed, and as an ornamental plant. It is native to much of China, and to Bhutan, Nepal, India, Burma, and Vietnam.
  
  ## Chemistry
  
  The flowers are known for their high content of fagopyrin, a naphthodianthrone that provokes phototoxic effects known as fagopyrism.
  
  