Long-stemmed flowers are a popular choice for bouquets and other floral arrangements. The three most common long-stemmed flowers are the IRIS, LILY, and zinnia. The IRIS is a genus of flowering plants with showy petals in shades of purple, blue, yellow, orange, and white. The LILY is a genus of flowering plants with large, trumpet-shaped flowers in shades of white, pink, yellow, and orange. The zinnia is a genus of flowering plants with daisy-like flowers in shades of red, orange, yellow, pink, and white.