The Orangelo variety, presumably a cross between a grapefruit and an orange, probably originated in Puerto Rico. In 1956 Carlos G. Moscoso of the Department of Horticulture of the University of Puerto Rico saw a wild seedling tree in the rural mountainous Angeles and Caguanas areas of Utuado municipality, which produced large, bright yellow fruit, and other seedling trees were found in isolated areas among the coffee plantations.
The name Chironja is a combination of Chi(na), the local term used for the sweet orange, and (to)ronja, the Spanish word for grapefruit.
The large Orangelo fruit is obovate or pear-shaped, and eaten in the same way as a grapefruit, but it is sweeter, paler, and easier to peel.
The tree closely resembles a grapefruit and produces isolated flowers.