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A rose is either a woody perennial flowering plant of the genus Rosa ( / ˈ r oʊ z ə / ), [ 4 ] in the family Rosaceae ( / r oʊ ˈ z eɪ s iː ˌ iː / ), [ 4 ] or the flower it bears. There are over three hundred species and tens of thousands of cultivars . [ 5 ] They form a group of plants that can be erect shrubs , climbing, or trailing, with stems that are often armed with sharp prickles . [ 6 ] Their flowers vary in size and shape and are usually large and showy, in colours ranging from white through yellows and reds. Most species are native to Asia , with smaller numbers native to Europe , North America , and Northwest Africa . [ 6 ] Species, cultivars and hybrids are all widely grown for their beauty and often are fragrant. Roses have acquired cultural significance in many societies....