A Clementine tree is a tangor, a cross between a mandarin and a sweet orange tree. Clementines prefer self-pollination. When cross-pollinated, fruit yields tend to be less and you’ll also miss out on desirable fruit characteristics too! Make sure to distance your clementine as far as possible from other mandarins when flowering begins.
A popular name brand name found in stores is Cuties. Depending on the season they may be Murcott tangors alternatively.