What are the biological characteristics of chrysanthemum?

Chrysanthemum is a perennial herb in Compositae. Plant height is 60 ~ 180 cm. The stems are erect, stout, multi-branched, turquoise or purple-brown, with gray hairs at the top, longitudinal grooves, prismatic, semi-lignified, and different internodes. The leaves are large, alternate, green to dark green, deeply concave, wedge-shaped at the base, rough on the surface, hairy on the back of the leaves, and glandular on the surface of the leaves, which can secrete a special chrysanthemum leaf fragrance. Head inflorescence (also called basket inflorescence), flowers are solitary or aggregated, with tongue-shaped flowers at the edge and tubular flowers in the middle. * * * born together on the disk, some are tongue-shaped flowers or tubular flowers. Inflorescences vary greatly in shape, color and size, such as spherical, laurel-shaped, coiled, pine needle-shaped, rosette-shaped, feather-like tubular and so on. Colors are extremely rich, which can be divided into yellow, white, red, purple and pink. The diameter of a single flower is 2 ~ 5 cm, and the diameter of a large flower can reach 10 ~ 20 cm. The seeds are tiny achenes, yellow-brown, swollen in the middle, slightly protruding at both ends, flat and wedge-shaped at the upper end, with longitudinal edges outside, and the life span of the seeds is 3-5 years.