Lumia (citrus)
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.
Moroccan citron
Chapot was probably first to describe this variety of citron in detail, along with illustrations of many forms of the fruit, and all the properties of the shrub, leaves and blossoms. He also mentions that the true citron of Morocco, which is traditionally only grown in the region of Assads, for the sake of the mitzva of four species, and is oblong, acidless and rather dry, is much different than the rounded citron hybrid, Rhobs el Arsa, that is more commonly grown for food in the entire country of Morocco, and its taste is acidic and fruity.