Sorrel (Rumex acetosa), also called common sorrel or garden sorrel, is a perennial herbaceous plant in the family Polygonaceae. Other names for sorrel include spinach dock and narrow-leaved dock ('dock' being a common name for the genus Rumex). Sorrel is native to Eurasia and a common plant in grassland habitats. It is often cultivated as a leaf vegetable or herb. Sorrel is a slender herbaceous perennial plant about 60 centimetres (24 inches) high, with roots that run deep into the ground, as well as juicy stems and arrow-shaped (sagittate) leaves. The lower leaves are 7 to 15 cm (3 to 6 in) in length with long petioles and a membranous ocrea formed of fused, sheathing stipules. The upper ones are sessile, and frequently become crimson. It has whorled spikes of reddish-green flowers, which bloom in early summer, becoming purplish. The species is dioecious, with stamens and pistils on different plants. (Source: Wikipedia.org, CC BY-SA)