(1) The author bred up a new amphidiploid plants at the progeny of the cross between “ Fuyo ” (H. mutabilis) (2n = 92) and “ Kusa-Fuyo ” (H. Moscheutos) (2n = 38). (2) The main characters of these new amphidiploid plants were as follows : These amphidiploid plants showed heterosis. The characteristics of stem and leaf resembled H. mutabilis which are shrublike. The flower size was larger, the flower coloring more beautiful, the beginning of flower openning earlier and the flower period was longer than the parents. Moreover the pollon fertility was as high and the size of pollen grains was larger than the parents. The seed shape was similar to H. mutabilis. The seeds had many surface hairs like H. mutabilis, but their color was darker than H. mutabilis, and their size was larger than in length, width and thickness. (3) In these amphidiploid plants, the chromosome conjugation at MI of PMCs showed 65_II with no irregularities. The chromosome number in root tips was 2n=130. (4) The author wou.Id like to propose that these new amphidiploid plants be given the Japanese name “ Ai-Fuyo ” and the scientific name H. muta-moscheutos KUWADA.