The genus Fortunella consists of five to six species of small, evergreen trees in the family Rutaceae. One of the species is commonly known as kumquat, and the fruit of this species is similarly referred to as kumquat. Other synonyms for the genus include Citrus japonica and Fortunella crassifolia. The kumquat fruit is a small, round or oval-shaped citrus fruit with a tangy-sweet taste, and its high nutritional value makes it a popular addition to salads, drinks, and dishes. The kumquat tree has white flowers and glossy, dark green leaves, making it an attractive ornamental plant. Several cultivars of kumquat are also available, each with unique characteristics.