The Summernavel tree and fruit are very similar to the Washington navel since it is a bud mutation. This tree is often used to provide navel oranges in the summer when Washington’s are not producing. It originates in Riverside California from J. A. Workman and was introduced commercially in 1942. The main difference is the thicker, rougher rind. The tree has larger leaves, is more vigorous in its spread and is also lower than the Washington.