The somatic chromosome numbers of three species and two varieties of
Hosta were ascertained:
H. tardiva, H. undulata and its var.
albomarginata are 2n=60,
H. undulata var.
erromena 2n=62 and
H. sacra 2n=63.
The karyotypes of
H. undulata and its var.
albomarginata were as follows: the 60 chromosomes were in 30 pairs, which could be classified into four pairs of large chromosomes, two pairs of medium ones, and 24 pairs of small ones. In
H. undulata var.
erromena, two of the medium chromosomes and two of the small ones were not exactly same in size and shape. These three entities are, from their karyotypes, considered to have descended from
H. lancifolia.
In
H. tardiva, two of the large chromosomes and two of the medium ones were remarkably different size and shape. The 63 chromosomes of
H. sacra could be classified into four pairs of large chromosomes, two pairs of medium ones, 51 small chromosomes of which 50 were in pairs.
H. sacra seems, judging from their geographical distribution and karyotype, to have derived from
H. sieboldiana.
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