The three types of cherries include sweet (Prunus avium), sour (P. cerasus), and wild (P. avium). Sweet cherries are usually large and heart-shaped. They include the deep-burgundy coloured Bing, Lambert, and Tartarian, common in the United States, and the yellow varieties, usually blushed with red, called Royal Ann, Rainier, or Napoleon. Royal Ann cherries are the ones specially processed, dyed red, and sold as maraschino cherries. Other sweet cherry varieties include the Bigaroon and Gean. Sour varieties, favoured for use in pies and preserves, include the brilliant red Montmorency and the smaller Morello.