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Western Dock (Rumex occidentalis S. Watson)

Also classified as Rumex aquaticus subsp. occidentalis (S.Watson) Hultén, Rumex occidentalis var. fenestratus (Greene) Lepage.

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Range - Expand

Native or Not Present
Native or Expanded

This tentative map is based on our own research. It may have limited data on Canada and/or Mexico, and there is some subjectivity in our assignment of plants as introduced vs. expanded. Read more in this blog post.


What is now considered to be Rumex occidentalis S. Watson by BONAP and POWO, was formerly lumped in with Rumex aquaticus L., a species now considered to be limited to Eurasia, and not found anywhere in North America. North American populations have been separated into their own species. This is why the USDA and some other older sources show Rumex aquaticus L. as occurring in North America whereas modern sources do not.

Rumex aquaticus (western dock) | USDA PLANTS Database (About This Site)

Rumex occidentalis | Biota of North America Project (BONAP) (About This Site)

Rumex occidentalis | Flora of North America (About This Site)