An old Portuguese lemon type that’s important historically because it is widely believed to be the ancestral source of Lisbon lemon. Lisbon is of Portuguese origin, although it is not known there by that name. It is believed to be a selection of the Gallego seedling clonal group, which in Portugal is somewhat comparable to the common sweet orange groups of Spain, Italy, and numerous other countries. Referring to the Lisbon lemon - "Galligan and Rosenberger—bud progenies are indistinguishable within the normal range of variation produced by environmental and disease factors. Since the Galligan orchard was planted in 1886 with trees from Florida, which are said to have been ordered as Villafranca, the probability exists that this selection is of that variety. There is general agreement, however, that Rosenberger differs appreciably from Lisbon in both fruit and tree characters and also from Galligan to a somewhat lesser degree. Since its bud parentage is uncertain, the writer believes it is best to consider Rosenberger a separate variety of unknown origin."