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 which grow from a rosette. 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 leaves are sessile, (growing directly from the stem without a petiole) 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.