The two different-color sets of petals that make up the intricate blooms of this plant actually aren't petals. The four outer "petals" are called sepals. These protect the inner parts of the flowers from damage. Once the sepals open, the true petals are revealed. Typically, there are four petals inside, often in a deep purple color. However, there are now many varieties with petals that swirl and twist to even more interesting shapes and color combinations.