Not to be semantically confused with : Burdock (Arctium species) [plants of similar name]

Easily mistaken for : Clustered Dock (Rumex conglomeratus) but that prefers frshwater margins, marshy grassland and other dampish places in the open. Other differences are shown in the photo captions.

Hybridizes with the similar : Clustered Dock (Rumex conglomeratus) to produce Rumex × ruhmeri which is the second-most fertile hybrid, but the similarity of both parents makes confirmation of the hybrid very difficult. It is probably frequent throughout the British Isles.

Although Docks do indeed have flowers they are seldom seen in real life and seldom mentioned or shown in identification books because the flowers themselves must have no unique identifying features apart from the shape of the tepals; unlike as with the fruits which come afterwards and last a lot longer than the flowers.