Rumex arcticus

Arctic Dock, a reference photo
Photo: DenaliNPS · Public domain

Rumex arcticus, commonly known as arctic dock or sourdock, is a perennial flowering plant that is native to Arctic and subarctic regions. Its leaves are an important part of the diet of the Alaska Natives such as the Yup'ik people, who include it in various dishes such as akutaq.

From Wikipedia, under CC BY-SA 4.0.

Is it poisonous?

We have no record of Arctic Dock being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Plantae
Phylum
Tracheophyta
Class
Magnoliopsida
Order
Caryophyllales
Family
Polygonaceae
Genus
Rumex
Species
Rumex arcticus

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