Cumquat

Kumquats or cumquats in Australian English are a group of small fruit-bearingtrees in the flowering plant family Rutaceae, either forming the genus Fortunella, or placed within Citrus sensu lato. The edible fruit closely resembles that of the orange (Citrus sinensis), but it is much smaller, being approximately the size and shape of a largeolive. Kumquat is a fairly cold hardy citrus.