Karyotypes of ten taxa of the geuns Lycoris have been analyzed minutely. Chromosomes of Lycoris are fundamentally classified into three categories, M, T, and A type as mentioned in the previous paper (Kurita 1986). Chromosome number and formulated karyotype of each taxon are summarized in Table 13.
L. aurea is highly sterile and it is supposed to be a hybrid or chromosomal mutant.
In L. albiflora, a new cytorace having 2n=18 is found. Karyotype of this race consists of 5M, 1T, 11A, and lm type chromosome. The m type chromosome must be a by-product of Robertsonian fusion of two A type chromosomes. This may be a hybrid between L. traubii and L. radiata.
Karyotype consisting of 3M, 5T, and 11A type chromosomes of L. cv. “lactiflora” is the flrst record in this genus. Origin of this sterile diploid plant is unknown.
Other three triploid sterile taxa are also considered to be hybrids, but the exact origin of them is undecided. L. squamigera may be a hybrid between L. straminea and L. sprengeri as pointed out by Inariyama, and a parent of L. houdyshelii is supposed to be L. longituba according to its karyotype and gross morphology. The m type chromosome found in a complement of L. incarnata must be a by-product of Robertsonian fusion between two A type chromosomes of an unknown parent.