What do they taste like you might be asking? The rind is thin and sweet but the juicy inside is tart and often salty tasting. The contrasting flavors makes this fruit such a delightful snack.
Up until 1915 the kumquat was included in the genus Citrus but Dr. Walter T. Swingle placed them in the genus Fortunella which contains 6 Asiatic species. One thing to note is that the Flora of China returns the kumquat to the genus Citrus The kumquat tree is slow growing and shrubby looking. They are believed to be native to China.
This photo was taken with a speedlight in a shoot through umbrella high and camera left and a second flash with a Lumiquest Softbox III camera right at 1/64th power. I used a Canon 5DII and a Tamron 28-75 f/2.8 lens at 75mm.
Canon 5DII | Tamron 28-75 | f/11 @ 1/125th sec. | ISO 200