The most likely origin for the lumia is the Mediterranean basin. The Lumia is also classified as
Citrus limon var. lumia by Swingle which places it under the taxonomy of
lemon, and
Citrus medica L. var. lumia, that suggests it is similar to citron. Lumias represent several distinct citrus hybrids. Usually lumias are referred to as a
citron hybrid, because of their size, thick peel and dryness of pulp. Pomo d'Adamo was also described by
Johann Christoph Volkamer as a
Cedrato which is Italian for a citron hybrid, whilst
Cedro refers to a true citron. A recent genomic analysis of several species commonly called "lemons" or "limes" revealed that the various individual lumias have different genetic backgrounds. The 'Hybride Fourny' was found to be an
F1 hybrid of a citron-
pomelo cross, while the 'Jaffa lemon' was a more complex cross between the two species, perhaps an
F2 hybrid. The Pomme d'Adam arose from a citron-
micrantha cross, while two other lumias, the ‘Borneo’ and ‘Barum’ lemons, were found to be citron-pomelo-micrantha mixes. In
The Citrus Industry, Hodgson wrote of the lumias: == Medicine ==