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== Vernacular names ==
*kumquat, kinkan (En).
Growth occurs only at relatively high temperatures. Trees normally come into bloom much later than ''Citrus'' species and enter the condition of induced dormancy earlier. Consequently, trees remain inactive and semi-dormant in subtropical and warm temperate climates during autumn, winter and spring and exhibit growth only during the comparatively short summer season. In the United States first blooms of early spring remain sterile. Fertile flowers appear in summer in axils of leaves on shoots developed in spring. Ripe fruits are harvested from October to January. In Vietnam flowering is in February-March and in June-August. Main harvest is in January-February, second harvest in May-June. In northern India flowering is in March-April and in September-October.
''[[Fortunella polyandra]]'' (Ridley) Tanaka (synonym: ''Citrus swinglei'' Burkill), the Malayan kumquat or "limau pagar", is a native of Peninsular Malaysia and Hainan and cultivated as a hedge or wayside shrub in Peninsular Malaysia only, where the desiccated fruit is sometimes sold as a specialty.
Many hybrids of ''Fortunella'' exist, both intrageneric and intergeneric. Intrageneric hybrids are: a) the "Meiwa" kumquat, possibly a hybrid between the oval and the round kumquat, with broadly oval fruits. Sometimes it is considered as a species (''Fortunella crassifolia'' Swingle). It is widely grown in Chekiang Province of China and called "chintan"; b) the "Changshou" kumquat, possibly a hybrid between two ''Fortunella'' species, a dwarf form, commonly known as potted plant in China. Sometimes it is considered as a species (''Fortunella obovata'' Tanaka). Bigeneric hybrids of ''Fortunella'' with ''Citrus'' and ''Poncirus'' are: limequats, orangequats, citrumquats, procimequats and calamondins. Calamondins are widely cultivated in the Philippines. Formerly they were named ''Citrus mitis'' Blanco, ''Citrus microcarpa'' Bunge or ''Citrus madurensis'' Lour. See the article on ×''Citrofortunella microcarpa'' (Bunge) Wijnands. Trigeneric hybrids of ''Fortunella'' are: citrangequats, citrangedins and faustrimedins.