Young Reddish Blonde Girl Posing On The Old Couch While Eating Mandarins

Biological characteristics
Citrus fruits are usually self-fertile (needing only a bee to move pollen within the same flower) or parthenocarpic (not needing pollination and therefore seedless, such as the satsuma).
Blossoms from the Dancy cultivar are one exception. They are self-sterile, and therefore must have a pollinator variety to supply pollen, and a high bee population to make a good crop. The fruit is oblate.