The sunflower blossom is composed of yellow ray flowers and a central disk, according to The Flower Expert. The central disk is composed of either yellow, brown, or purple flowers, depending on the species. The flower is actually a head of numerous flowers crowded together. The outer flowers on the sunflower are called ray florets and can be yellow, maroon, orange or other colors. The flowers that fill the circular head inside the ray flowers are called disc florets.