Canaigre

The true tannic acids are also widely distributed; […] in roots, as in the Texas plant, a Rumex commonly known as "Cañaigre;" […]

The Commissioner of Agriculture, in his report for 1878, speaking of this plant, says: "The examination of the canaigre, for tannin, shows the existence of a very abundant source of this important material, and gives reason for the belief that the latter at least may soon afford a cheap supply to the arts.["]

The native people of the Southwest have for many years made a very soft, impervious and durable leather by tanning hides with an extract of the roots of the cañaigre, Rumex hymenosepalus.

Considerable attention is being paid by the press to canaigre as a plant, the cultivation of which may become profitable in this State, and it seems probable that it may become one of the valuable minor industries.

cannaigre or tanner's dock (Rumex hymenosepalus), a plant now being cultivated in the Western States for the production of tannin.

Some years ago, when I was connected with the Arizona Experiment Station, some efforts in that direction were being made with a plant grown down in that country called Canigre. That is a plant that grows wild in certain sections of the Southwest, but because of its being a two-year crop and because of the fact that in order to make it productive, a very large amount of water was required, which made it an irrigation proposition, we determined that it would be an unprofitable crop at that time.

Canaigre, the root of Rumex hymenosepalus Torr., was marketed in the late 1970s under such coined names of modern vintage as wild red American ginseng and wild red desert ginseng. […] It is obvious that the attempt to promote canaigre as a kind of American ginseng is a recent-day deceptive practice, probably due to the high prices now commanded by ginseng. Canaigre does not contain any of the active panaxoside-like saponin glycosides responsible for ginseng's physiological activities.

Other teas that are potentially toxic include canigre, guarana, maté, foti and comfrey (discussed below).