The Williams' bon chrétien pear, commonly called the Williams pear, or the Bartlett pear in the United States and Canada, is a cultivar of the species Pyrus communis, commonly known as the European pear. The fruit has a bell shape, considered the traditional pear shape in the west, and its green skin turns yellow upon later ripening, although red-skinned derivative varieties exist. It is considered a summer pear, not as tolerant of cold as some varieties. It is often eaten raw, but holds its shape well when baked, and is a common choice for canned or other processed pear uses.