What's the name of buttercup?

Ranunculus ternatus (gèn), whose scientific name is celery flower and lotus flower, is a perennial herbaceous flower of Ranunculaceae. Rich in colors, mostly double or semi-double, the flower shape is similar to peony, but smaller, and the flower diameter is generally 8 cm ~1ocm; Leaves are like celery leaves, so they are often called celery flowers. Native to southeast Europe and southwest Asia. Artificial cultivation was introduced by the British in 1596, which is very common in gardens and cut flowers. Many countries have cultivated it, such as the Netherlands, Britain, France, the United States, Japan, etc., and also cultivated many varieties of cut flowers and potted plants. China has been introduced from Holland and Japan since1990s, and has been cultivated in several big cities as cut flowers, potted plants and flowers for spring flower shows.