Botanical name: Fortunella japonica
Common names: Marumi Kumquat, Round Kumquat, Sweet-peeled Kumquat
Family: Rutaceae
Origin: China
Leaves of the Round Kumquat are small, evergreen, glossy, and deep-green. Flowers are simple, white and fragrant.
Similar plants: Fortunella japonica (Marumi Kumquat)
Link to this plant:
https://toptropicals.com/catalog/uid/fortunella_japonica.htm