The Kumquat tree is a small, evergreen fruit tree of the family Rutaceae classified as genus Fortunella; Kumquat trees are historically classified as a citrus tree (genus Citrus), but the Swingle system of citrus taxonomy placed them in their own genus.
Meiwa Kumquat trees are a natural hybrid of Marumi and Nagami Kumquats. They were first brought to Japan during the Meiwa period 1764-72, hence the name. Kumquat trees were introduced to Europe by Robert Fortune in 1846 and shortly after to North America. Kumquat trees are divided into multiple species and one of them is the sweet Meiwa Kumquat tree (Fortunella crassifolia).
A Kumquat tree can grow as tall as 4’-8’ ft with dense branches that are relatively thornless. This citrus tree has glossy, dark green foliage and white fragrant blooms that occur singly or in clusters on the leaf axils.
 
The Nagami kumquat tree for sale from Florida features small, evergreen leaves, fragrant white flowers about 1 inch in size, and produces oval-shaped, sweet-tart fruits with a tangy flavor.