Rumex pseudonatronatus, common name field dock or Finnish dock, is a plant species native to northern Europe and northern Asia, known from Asiatic and European Russia, China, Mongolia, Kazakhstan, Kyrgyzstan, Finland, Norway, Sweden, Belgium, Netherlands, Estonia, Latvia, Lithuania, Poland, Belarus, etc. It is naturalized and a common weed in much of Canada and to the north-central United States. It is known from every Canadian province from Québec to British Columbia, plus Yukon, North Dakota, South Dakota and Minnesota. It grows in wet and/ore disturbed sites along stream banks, lake shores, roadsides, ditches, cultivated fields, meadows, etc.