Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Rumex
Species: R. pulcher
Binomial name: Rumex pulcher
Common name: Fiddle dock

Rumex pulcher is a species of flowering plant in the knotweed family known by the common name fiddle dock. It is native to Eurasia and North Africa and it can be found in New Zealand, as an introduced species and a roadside weed.
It is quite variable in appearance, and some authorities divide it into several subspecies that are more or less distinguishable. In general, it is a perennial herb producing a slender, erect stem from a thick taproot, approaching 70 centimetres in maximum height. The top of the plant may bend, especially as the fruit develops. The leaves are up to 10 or 15 centimetres long and variable in shape, though often oblong with a narrow middle in the rough shape of a fiddle. The inflorescence is made up of many branches, each an interrupted series of clusters of flowers with up to 20 in each cluster, each flower hanging from a pedicel. The flower has usually six tepals, the inner three of which are edged with teeth and have tubercles at their centres.

Rumex pulcher Fiddle dock-1.JPG 

A young plant.
1-Rumex pulcher Fiddle dock-003.JPG

The shape of its leaf like a fiddle gave it it's name "Fiddle dock"
Rumex pulcher leaf Fiddle dock.JPG 
1-Rumex pulcher Fiddle dock-001.JPG 
Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/