The sunflower's florets inside the circular head are called -----, which mature into seeds.

Sunflower heads are composite flowers consisting of two types of florets: ray florets (the outer petal-like structures) and disc florets (the small flowers tightly packed in the center). The disc florets are arranged in a spiral pattern and are responsible for seed production, maturing into achenes (the seeds we eat). Ray florets are sterile and only serve to attract pollinators.