In total, there are about 50 species of kupen, and various varieties differ not only in the color and shape of flowers, but also in the size of the bush itself (for example, the giant Chinese kupen grows to a height of 120 cm).
Guud ahaan, waxaa jira ilaa 50 nooc oo kupen ah, noocyo kala duwanna ma aha midabka kaliya ee midabka iyo qaabka ubaxa, laakiin sidoo kale xajmiga baadiyaha laftiisa (tusaale ahaan, kup oo ah shong ee shiinaha ah wuxuu koraa dhererka 120 cm).