Rumex
/ˈruːmɛks/Botany
noun
A large genus of flowering plants belonging to the knotgrass family (Polygonaceae), native chiefly to the north temperate regions and including the sorrels and docks. Also (in form rumex): a plant of this genus.
Origin
Mid 16th century; earliest use found in John Hall (1529–1568/9), surgeon and author. From classical Latin rumex sorrel (adopted as a genus name by Linnaeus in his Species Plantarum I. 333), of unknown origin.