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canaigre(kənī`grē): see buckwheatbuckwheat,
common name for certain members of the Polygonaceae, a family of herbs and shrubs found chiefly in north temperate areas and having a characteristic pungent juice containing oxalic acid. Species native to the United States are most common in the West.
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(Rumex hymenosepalus), a perennial plant of the genus Rumex, approximately 1 m in height. It grows wild in the southern United States and in Mexico. The radical tubers contain tannides, which are used to tan soft leather.