Chrysanthemum coronarium and emperor's lettuce are the same species of vegetables, there is no difference. Chrysanthemum coronarium in ancient times for the court delicacies, so it is also called the emperor's vegetable, Chrysanthemum coronarium belongs to the annual or biennial herbaceous plants, the leaf blade is elongated pinnatifid, the flower is yellow, white, similar to the wild chrysanthemum, the stem and leaves can be eaten when they are young, and they can be used as medicine.