Chrysanthemum alias Yellow Flower, Nine Flowers, Female Hua, Sun Essence, Jie Hua, Zhu Ying, Yan Shou Kak, Yan Ling Kak, Yin Wei, Shou Kak, Rejuvenation, Golden Rui, Zhou Ying, Yellow Rui, Golden Autumn Chrysanthemum .　Smiling Gold, Family Chrysanthemum (an alias of chamomile), Golden Essence (an alias of chamomile), Fu Yan Nian, Avian Hua, Yue Duo (an alias of white chrysanthemum), Official Yellow (an alias of citrus chrysanthemum) Chrysanthemums (Dendranthemamorifolium) Cultivated species of plants of the genus Chrysanthemum in the family of Asteraceae, is a valuable ornamental flower cultivated through long-term artificial selection, also known as Art Chrysanthemum, or Bao Chrysanthemum. There are more than a thousand species. It is a perennial herb. The height of the plant is 20-200cm, usually 30-90cm. The stems are tender green or brown in color, and except for the cliff chrysanthemum, they are mostly erect and branched, and the bases are semi-woody. The single leaf is alternate, ovoid to oblong, and the edge is notched and serrated. Heads terminal or axillary, one or several clusters. Ligulate flowers are female, tubular flowers are bisexual. The ligulate flowers are divided into four categories: flat, spoon, tube and malformed, with a variety of colors, including red, yellow, white, ink, purple, green, orange, pink, brown, snowy green, light green, etc. The tubular flowers develop into flowers with a variety of colors. The tubular flowers have developed into "togui petals" with various colors, and the colors of the flowers are red, yellow, white, purple, green, pink, mixed colors, and inter-colored, etc. The size and shape of the inflorescences vary.　Inflorescences of different sizes and shapes, there are single petals, there are heavy petals; there are flat, there are spherical; there are long flocculent, there are short flocculent, there are flat flocculent and curly flocculent; there are hollow and solid; there are straight and drooping, a wide variety of styles, varieties and complexity. According to the flowering period, there are early chrysanthemums (open in September (October to November), late chrysanthemums (December to January) August chrysanthemums, July chrysanthemums, May chrysanthemums and so on. According to the size of the flower diameter, those with a diameter of more than 10 centimeters are called large chrysanthemums, those with a diameter of 10-6 centimeters are medium chrysanthemums, and those with a diameter of less than 6 centimeters are small chrysanthemums. According to the petal type, there are more than ten types of chrysanthemums which can be divided into three categories: flat petal, tube petal and spoon petal. Species Classification: Chrysanthemums bloom in late fall and have a strong fragrance, so they are known as "Late Blooming" and "Cold Fragrance".　Classification: Asteraceae, Chrysanthemum, sometimes also used as a general term for all flower species in the Asteraceae family.　Asteraceae is the largest family of seed plants, with a total of 25,000-30,000 species, and its flower species are also many, second only to orchids.　There are more than 30 species in the genus Aster, and 17 species are native to China, mainly including: wild chrysanthemum, chrysanthemum, chamomile, small red chrysanthemum, purple chrysanthemum, chrysanthemum brain and so on.