A rose is a perennial flower shrub or vine of the genus Rosa, within the family Rosaceae, that contains over 100 species and comes in a variety of colours. The species form a group of erect shrubs, and climbing or trailing plants, with stems that are often armed with sharp prickles. Roses are best known for their flowers. Roses are popular garden shrubs, as flowering shrubs. They are also grown as cut flowers, as one of the most popular and commonly sold florists' flowers. Roses are also of great value to the perfume industry. Roses are ancient symbols of love and beauty. A bouquet of red roses is often used to show love. It is used as a Valentine's Day gift in many countries.