A rose is a woody perennial flowering plant. There are over a hundred species and thousands of cultivars. This group of plants can be erect shrubs, climbing or trailing with stems that often have thorns. Flowers vary in size and shape and are usually large and showy, in colours ranging from white, yellows, reds, pinks and purples. Most species are native to Asia, with smaller numbers native to Europe, North America, and northwestern Africa. Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Rose plants range in size from compact, miniature roses, to climbers that can reach 7 m in height. Different species hybridize easily, and this has been used in the development of the wide range of garden roses. During the fifteenth century, the rose was used as a symbol for the factions fighting to control England. The white rose symbolized York, and the red rose symbolized Lancaster, as a result, the conflict became known as the "War of the Roses."