In many plants of the aster family such as the sunflower, "Helianthus annuus", the circumference of the flower head is composed of ray florets. Each ray floret is anatomically an individual flower with a single large petal. Florets in the center of the disc typically have no or very reduced petals. In some plants such as "Narcissus" the lower part of the petals or tepals are fused to form a floral cup (hypanthium) above the ovary, and from which the petals proper extend.