Dockweed (Rumex spp.) is a taxonomically difficult genus as species frequently interbreed. Sorrel is an erect, highly branched, perennial herbaceous plant, up to 1.5 meters tall and reddish-brown in color when mature. The basal leaves are much longer than broad, wavy-edged and lanceolate in shape, up to 30-40 cm, forming dense clusters on the lower part of the plant. The stem has stipules, a species of tiny leaves found at the point where the base of the leaf petiole joins the branch. The fruit is a shiny nut, with three sharp edges, reddish brown.