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 mustard-yellow dye. The leaves and leaf stalks are considered edible when young, the older leaf stalks cooked and eaten like rhubarb. 
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