Abstract
(1) The author bred up a new amphidiploid plant at the progeny of the cross between“Fuyo” (H. mutabilis) (2n=92) and“Momiji-Aoi”(H. coccineus) (2n=38).
(2)The main characteristics of this new amphidiploid plant named“Momiji-Fuyo”were as follows:
This amphidiploid plant showed heterosis. The stem resembled H. mutabilis which are shrublike. The color of stem, petiole and vein were intermediate of the parents. The flower color was beautiful like H. coccineus. The petal size and flower size across were larger than the parents. The flowering period was longer than the parents, about 110 days. The calyx was 5-toothed like the parents. The number of bracteole was intermediate of the parents.
The pollen fertility was higher and the size of the pollen grains was larger than the parents. The seed number per pod was intermediate of the parents. The seed shape was similar H. mutabilis. The seeds had many hairs on their surface like H. mutabilis, but their color was darker than H. mutabilis and their size was larger than H. mutabilis in length, width and thickness.
(3) In these amphidiploid plants, the chromosome configuration at MI of PMCs showed 65II with no irregularities. The chromosome number in root tips was 2n=130.
(4) The author would like to propose that these new amphidiploid plants be given the Japanese name “Momiji-Fuyo”and scientific name H. muta-coccineus KUWADA.
