Key lime
The Key lime ("Citrus aurantiifolia") is a hybrid of the micrantha and the citron. It, in turn, has been crossed with a lemon to produce the Persian lime ("C. lantifolia"). There are lumias that are distinct micrantha/citron hybrids, such as the Pomme d'Adam, while other lumias, like the Borneo lemons, are micrantha/citron/pomelo tri-species hybrids. An Indonesian hybrid, the nansaran ("C. amblycarpa"), is a "C. hystrix"/"C. reticulata" cross.