Butter Dock
Rumex longifolius DC.

Rumex longifolius is a perennial plant species in the genus Rumex, belonging to the family Polygonaceae. It is commonly known as Butter Dock and is native to regions including Greenland, Labrador, Newfoundland, and parts of Canada and Europe. The species was first described in 1815.
Description
Rumex longifolius, also referred to as Butter Dock, is a perennial member of the Polygonaceae family. It is widely distributed across northern regions such as Greenland, Labrador, Newfoundland, and various Canadian provinces, as well as parts of Europe. The plant was first formally described in 1815. It is recognized as part of the Rumex genus, which includes various dock and sorrel species.
Other common names
Dooryard dockButter DockField DockLong-Leaved DockLongleaf DockNorthern DockYard Dock
Distribution
Greenland · Labrador · Newfoundland · Alberta · British Columbia · Manitoba · New Brunswick · Nova Scotia · Ontario · Prince Edward Island · Quebec · Saskatchewan · Yukon · Saint Pierre and Miquelon · Portugal Continental · DK · FI · IS · NO · SE · CL · Belgium · Flemish Region · Walloon Region · France · The Netherlands · Great Britain · FO · IT · Svalbard
Synonyms
Rumex domesticusRumex hippolapathum