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While most other citrus are diploid, many of the Key lime hybrid progeny have unusual chromosome numbers. For example, the Persian lime is triploid, deriving from a diploid Key lime gamete and a haploid lemon ovule. A second group of Key lime hybrids, including the Tanepao lime and Madagascar lemon, are also triploid but instead seem to have arisen from a backcross of a diploid Key lime ovule with a citron haploid gamete. The "Giant Key lime" owes its increased size to a spontaneous duplication of the entire diploid Key lime genome to produce a tetraploid.