Sunflower [Helianthus annuus] is an annual plant native to the Americas member of family Asteraceae. It possesses a large inflorescence [flowering head].
The sunflower is named after its huge, fiery blooms, which shape and image is often used to depict the sun. The sunflower has a rough, hairy stem, broad, coarsely toothed, rough leaves and circular heads of flowers.
The heads consist of many individual flowers which mature into seeds, often in the hundreds, on a receptacle base.
Photos: HortPark, Singapore 20120526