An aneuploid hybrid (2n = 23) of F. moschata (2n = 42) and P. fruticosa (2n = 14) was fertilized with pollen of both parents, separately and combined in a pollen mixture. Seven vigorous progeny plants were obtained, with chromosome numbers 2n = 44, 49, 63, 63, 65, 67 and 67. It is shown that each number could be produced by the fertilization of unreduced and double unreduced gametes of the hybrid by normally reduced gametes of one of the parental species.