Sunflower is English for sunflower. Named after the inflorescence rotates with the sun. Annual herb, with a height of1-3.5m and a maximum height of 9m. The stems are erect, round and angular, hard and covered with white coarse bristles. Leaves broadly ovate usually alternate, apex acute or acuminate, with 3 veins at the base, and margin coarsely serrate.

Head, diameter 10-30 cm, solitary at the top of stem or branch. The involucral bracts are multi-layered, leafy, imbricate, hirsute, flowering in summer, with neutral yellow tongue-shaped flowers at the edge of inflorescence, which are not fruitful. The middle of the inflorescence is bisexual tubular flower, brown or purple, which can bear fruit. Achenes with oval shape, lignified skin, gray or black, are called sunflower seeds.

Extended data

The habitats of wild sunflowers are mainly grasslands and dry and open areas. They grow along roadsides, fields, desert edges and grasslands. It grows best in sunny, humid or disturbed areas. Native to South America, the domesticated species was brought to Europe from North America by the Spanish in 15 10, originally for ornamental purposes.

/kloc-at the end of 0/9th century, it was introduced back to North America from Russia. It is cultivated all over the world and in China. Through artificial cultivation, many varieties are formed in different habitats, especially in the size, color and achene morphology of the flower heads, which are the best raw materials for comprehensive utilization.

Mainly divided into two categories, edible and ornamental. Sunflower seeds, called sunflower seeds, are semi-drying oil with high oil content. They are delicious and delicious for eating. Spike, seed husk and stem can be used as feed and industrial raw materials.