Sunflowers make up the genus Helianthus. In Greek helios means sun and anthos means flower, thus Sunflower. The large, solitary Sunflower blossom, sometimes as large as a meter in diameter, is composed of yellow ray flowers and a central disk.n The Central disk is composed of either yellow, brown, or purple flowers, depending on the species. The flower is actually a head (formerly composite flower) of numerous flowers crowded together. The outer flowers on the Sunflower are the ray florets and can be yellow, maroon, orange, or other colors. These flowers are sterile. The flowers that fill the circular head inside the ray flowers are called disc florets.
Sunflower is the national flower of Russia and the state flower of Kansas, USA. Sunflower is notable for turning to face the Sun, a behavior known as heliotropism. Sunflowers were cultivated by Native Americans well over 1000 years ago. Sunflower heads consist of 1,000 to 2,000 individual flowers joined together by a receptacle base.
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