There are three types of clementines: seedless clementines, clementines (maximum of 10 seeds), and Monreal (more than 10 seeds). Clementines resemble other citrus varieties, such as the satsuma and tangerines.
Clementines differ from other citrus in having lower heat requirement, which means the tolerance to fruit maturity and sensitivity to unfavorable conditions during the flowering and fruit-setting period is higher. However, in regions of high total heat, the Clementine bears fruit early—only slightly later than satsuma mandarins. These regions, such as North Africa, Mediterranean basin, and California, also favor maximizing the Clementine size and quality.
It was introduced into Californian commercial agriculture in 1914, though it was grown at the Citrus Research Center (now part of the University of California, Riverside) as early as 1909. Clementines lose their desirable seedless characteristic when they are cross-pollinated with other fruit. In 2006, to prevent this, growers—such as Paramount Citrus in California—threatened to sue local beekeepers to keep bees away from their crops.
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