citrus japonica

From The Collaborative International Dictionary of English v.0.48:

kumquat \kum"quat\, n. [Chin. kin keu.] (Bot.)
   any of several trees or shrubs of the genus Fortunella
   (formerly Citrus) of the rue family (Rutaceae)
   (especially Citrus Japonica) growing in China and Japan
   bearing small orange-colored edible fruits with thick
   sweet-flavored skin and sour pulp; also, any of the small
   acid, orange-colored citrus fruits of such plants, used
   mostly for preserves. [Also spelled cumquat.]
   [1913 Webster + WordNet 1.5]
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