Kumquats (Citrus japonica) are a group of small fruit-bearing trees in the flowering plant family Rutaceae. They were previously classified as forming the now-historical genus Fortunella, or placed within Citrus sensu lato.
The edible fruit closely resembles the orange (Citrus sinensis) in color and shape but is much smaller, being approximately the size of a large olive. Kumquat is a fairly cold-hardy citrus.
Evergreen shrubs or trees grown for their tart orange fruits. Native to eastern Asia, these small trees are cultivated throughout the subtropics. Kumquat fruits may be eaten fresh, or they may be preserved and made into jams and jellies. In China they are frequently candied. Branches of the kumquat tree are used for Christmas decoration in parts of the United States and elsewhere.