salinusRumex salinusRumex saxei Rumex hymenosepalus, commonly known as canaigre, canaigre dock, ganagra, wild rhubarb, Arizona dock, and tanner's dock,[2] 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.

[3] It has been cultivated in the southwestern United States for the roots, a good source of tannin, which is used in leather tanning.

[4] 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.

[5] Rumex hymenosepalus was first described by American botanist John Torrey in the Report on the United States and Mexican Boundary in 1859.