title: Rumex hymenosepalus
text: # Rumex hymenosepalus
  
  Rumex hymenosepalus, commonly known as canaigre, canaigre dock, ganagra, wild rhubarb, Arizona dock, and tanner's dock, is a perennial flowering plant which is native to the North American deserts in the southwestern United States and northern Mexico. It is a common food plant of the ruddy copper larvae.
  
  ## Uses
  
  It has been cultivated in the southwestern United States for the roots, a good source of tannin, which is used in leather tanning. It also yields a warm, medium brown dye.
  
  The leaves and leaf stalks are considered edible when young, the older leaf stalks cooked and eaten like rhubarb, which is in the same plant family.
  
  ## Taxonomy
  
  Rumex hymenosepalus was first described by American botanist John Torrey in the Report on the United States and Mexican Boundary in 1859.
  
  ### Synonyms
  
  * Rumex arizonicus Britton
  * Rumex salinus A. Nelson
  * Rumex hymenosepalus var. salinus (A. Nelson) Rech.
  * Rumex saxei nom. nudum. UNAM
  