Rumex hydrolapathum

Great Water Dock
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Rumex
Species: R. hydrolapathum
Binomial name
Rumex hydrolapathum
Huds.

Rumex hydrolapathum Huds. (Great Water Dock; Water Dock; Giant Water Dock) is a species of perennial herbaceous plants in the genus Rumex native to fens and freshwater banks of Europe and Western Asia. It is the tallest species in the genus, with flowering stems attaining a height of 1.5-2 m.

It is one of few decaploid organisms, containing 200 individual chromosomes.