Satsumas are also usually seedless, while Clementines will produce seeds if a pollinizer is nearby. This is one of the new citrus of mixed genetics that confounds straightforward categorization. A cross of 'Clementine' with 'Orlando' tangelo, you might see it marketed as either an orange or a Mandarin. The flesh tastes like a particularly juicy orange with a hint or more of Mandarin. Not yet widely available, it is particularly popular in Florida.
Fruits are medium-size and distinctly tapered toward the neck.
They're easy to peel and seedless without cross-pollination, seedy with it. Their arrival in the markets in winter is cause for celebration. Clementines are a group of Mandarins. Most Clementines that reach the U.S. are grown in Mediterranean Europe and are seedless varieties. New seedless varieties of Clementine Mandarins from Europe are being tested in California, so I expect they will soon be as popular in the West as they are in the East.