Kumquat
Kumquat, a small, evergreen shrub or tree native to China. It is closely related to the orange. Kumquats may be cultivated, wherever citrus fruits will grow, both as ornamentals and for their fruits. The leaves, four to six inches (10 to 15 cm) long, are glossy, deep green above and dull, pale green below. Clusters of fragrant white flowers are followed by oval or round fruits, 1 to 1 1/2 inches (2.5 to 4 cm) wide, resembling oranges. The fruits are eaten fresh or are preserved, candied, or made into marmalade.
Kumquats belong to the genus Fortunella of the rue family, Rutaceae. The oval kumquat is F. margarita ; the round, F. japonica.
Kumquat shrubs and trees have clusters of fragrant white flowers and round fruits resembling oranges.