What colour are kumquats?

Kumquats, or cumquats in Australian English, are a group of small, angiosperm, fruit-bearing trees in the family Rutaceae. Their taxonomy is disputed.

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. The kumquat is a fairly cold-hardy citrus.

The kumquat plant is native to Southern China. The historical reference to kumquats appears in literature of China from at least the 12th century. They have been cultivated for centuries in other parts of East Asia, South Asia, and Southeast Asia. They were introduced to Europe in 1846 by Robert Fortune, collector for the London Horticultural Society, and are now found across the world.