Kumquats are a group of small fruit-bearing trees in the flowering plant family
Rutaceae. Their
taxonomy is disputed. They were previously classified as forming the now-historical
genus Fortunella or placed within the genus
Citrus,
sensu lato. Different classifications have alternatively assigned them to anywhere from a single species,
C. japonica, to numerous species representing each cultivar. This photograph, depicting one halved and two whole kumquats, was
focus-stacked from 22 separate images.
Photograph credit: Ivar Leidus