Assortment of common wild plants growing on a river bank. The large, yellow-flowered plant is a species of ragwort or ragweed, Senecio sp.. In the foreground are brambles (left), a nettle Urtica dioica (centre), and broad-leaved docks Rumex obtusifolius (right). The white umbelliferous flowers are probably ground elder, Aegopodium podagraria, and the purple, thistle-like flowers (right & background) are a type of knapweed, Centaurea sp.