It is a natural hybrid between lemon and grapefruit. It spread in the 1970s and is classified as 'Citrus Imperial Lemon' in Kew Gardens in London.
It is an evergreen, vigorous, thorny plant, with large, deep green leaves, re-flowering, but which never bears abundant fruit and has very showy fruits. The flowers are large, white, very fragrant, mainly arranged in clusters. It can even reach 15 meters in height and is a little less resistant to cold than lemon, very interesting for ornamental purposes.
The fruits are very large in size and can reach 10-15 cm in diameter. They are similar in shape to grapefruit, but are more elongated and of a nice yellow color. The peel is yellow, smooth, rich in essential oils. The pulp, also yellow in color, is juicy, tasty and less acidic than lemon with a touch of bitterness from grapefruit.