Citrus japonica (Kumquat, Round Kumquat)

The kumquat, round kumquat, Marumi kumquat, or Morgani kumquat is an evergreen tree that produces edible golden-yellow fruit. The fruit is small and usually spherical but can be oval shaped. The peel has a sweet flavor, but the fruit has a distinctly sour center. The fruit can be eaten cooked but is mainly used to make marmalades, jellies, and other spreads.