The beetroot is the taproot portion of a beet plant, usually known in North America as beets while the vegetable is referred to as beetroot in British English, and also known as the table beet, garden beet, red beet, dinner beet or golden beet. It is one of several cultivated varieties of Beta vulgaris grown for their edible taproots and leaves (called beet greens); they have been classified as B. vulgaris subsp. vulgaris Conditiva Group. Other cultivars of the same species include the sugar beet, the leaf vegetable known as chard or spinach beet, and mangelwurzel, which is a fodder crop. Three subspecies are typically recognized. Beta is the ancient Latin name for beetroot, possibly of Celtic origin, becoming bete in Old English. Root derives from the late Old English rōt, itself from Old Norse rót. The domestication of beetroot can be traced to the emergence of an allele, which enables biennial harvesting of leaves and taproot. Beetroot was domesticated in the ancient Middle East, primarily for their greens, and were grown by the Ancient Egyptians, Greeks, and Romans. By the Roman era, it is thought that they were also cultivated for their roots. From the Middle Ages, beetroot was used to treat various conditions, especially illnesses relating to digestion and the blood. Bartolomeo Platina recommended taking beetroot with garlic to nullify the effects of "garlic-breath". During the middle of the 19th century, wine often was colored with beetroot juice. Food shortages in Europe following World War I caused great hardships, including cases of mangelwurzel disease, as relief workers called it. It was symptomatic of eating only beetroot. Usually, the deep purple roots of beetroot are eaten boiled, roasted, or raw, and either alone or combined with any salad vegetable. The green, leafy portion of the beetroot is also edible. The young leaves can be added raw to salads, while the mature leaves are most commonly served boiled or steamed, in which case they have a taste and texture similar to spinach.