Kumquat is a small evergreen citrus tree native to southeastern China, grown for its small orange fruit. The fruit is eaten whole: the peel is sweet, while the flesh is tart. The Marumi form has round fruit, while the Nagami variety has oval fruit.
Marumi fruit is round, while Nagami fruit is distinctly oval. Leaves or a photo without fruit may not show this difference clearly.
Why they get mixed upBoth are small kumquats with orange fruit.