Rumex hymenosepalus, commonly known as canaigre, ganagra, wild rhubarb, Arizona dock, and tanner's dock, is a perennial flowering plant which is native to the western United States and northern Mexico.
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. 
Rumex hymenosepalus was first described by John Torrey in the Report on the United States and Mexican Boundary. 
Rumex arizonicus Britton Rumex salinus A. Nelson Rumex hymenosepalus var. salinus (A. Nelson) Rech. Rumex saxei nom. nudum. UNAM
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